{"title":"Mattresses","description":"\u003cdiv class=\"sbe-mxl-seo__grid\"\u003e\n\u003cdiv class=\"sbe-mxl-seo__intro\"\u003e\n\u003ch2\u003ePocket sprung mattresses from Sofa Bed Expert\u003c\/h2\u003e\n\u003cp\u003eThe Sofa Bed Expert mattress range is two pocket sprung mattresses for a standard bed: the firm, orthopaedic \u003ca href=\"\/products\/align-1000-firm-orthopaedic-mattress\"\u003eAlign 1000\u003c\/a\u003e and the soft, cushioning \u003ca href=\"\/products\/serenity-1000-soft-pocket-sprung-mattress\"\u003eSerenity 1000\u003c\/a\u003e. Both are built from the same five layers: a 2 cm quilted cooling gel memory foam top, a 4 cm Flex Comfort Foam layer, a 16 cm core of 1,000 individually pocketed springs, a reinforced Flex Support Border and a 3 cm Flex Support Foam base, for a total depth of approximately 25 cm. Both are FIRA tested.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sbe-mxl-seo__cards\"\u003e\n\u003cdiv class=\"sbe-mxl-seo__card\"\u003e\n\u003ch3\u003eFirm or soft pocket sprung mattress?\u003c\/h3\u003e\n\u003cp\u003eChoose the Align 1000 if you sleep on your back or front, find a soft bed unsupportive, or want a firm orthopaedic feel that keeps the spine level. Choose the Serenity 1000 if you sleep on your side, find a firm bed too hard on the hips and shoulders, or prefer to sink gently into the surface. The pocket spring core is identical, so the support underneath is the same on both. Only the comfort layer changes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sbe-mxl-seo__card\"\u003e\n\u003ch3\u003eSizes, price and delivery\u003c\/h3\u003e\n\u003cp\u003eEach mattress comes in Double (135 × 190 cm) and King Size (150 × 200 cm) and fits any standard UK bed frame or divan base of the same size. Prices start at £399 for a Double and £499 for a King Size, with free delivery in 3 to 4 days across England, Wales and Scotland, 14 days to return or exchange from the day after delivery, and a 48 hour cooling off period after ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sbe-mxl-seo__card\"\u003e\n\u003ch3\u003eSleeping on a sofa bed rather than a bed?\u003c\/h3\u003e\n\u003cp\u003eThese mattresses are for a standard bed frame or divan. For a sofa bed, our \u003ca href=\"\/products\/memory-foam-mattress-topper\"\u003eCool Gel Memory Foam Topper\u003c\/a\u003e is cut to the exact sleeping areas of Sofa Bed Expert sofa beds and rolls away when you fold the bed up.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n","products":[{"product_id":"align-1000-firm-orthopaedic-mattress","title":"Align 1000 Firm Orthopaedic Mattress","description":"\u003cdiv class=\"sbe-pd\"\u003e\n\u003ch2\u003eFirm, orthopaedic support that stays cool all night\u003c\/h2\u003e\n\u003cp class=\"sbe-pd-lead\"\u003eFirm, supportive and cool: 1,000 pocket springs under a layer of gel memory foam.\u003c\/p\u003e\n\n\u003cp\u003eThe Align 1000 is our firmer mattress, built for people who find a soft mattress too yielding. A 16 cm core of 1,000 individually pocketed orthopaedic springs holds your body level through the night, while a quilted layer of cooling gel memory foam takes the pressure off hips and shoulders without letting you sink in. The result is a stable, well supported sleeping surface that stays firm to the edge and stays cool until morning.\u003c\/p\u003e\n\n\u003cp class=\"sbe-pd-note\"\u003e\u003cstrong\u003eWhy a sofa bed company makes mattresses.\u003c\/strong\u003e For years customers have told us their Sofa Bed Expert sofa bed is more comfortable than the bed upstairs, and asked whether we could make a mattress for a proper bed. The Align 1000 and its softer sister, the \u003ca href=\"\/products\/serenity-1000-soft-pocket-sprung-mattress\"\u003eSerenity 1000\u003c\/a\u003e, are the answer. \u003ca href=\"\/collections\/mattresses\"\u003eRead the full story\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWho the Align 1000 is for\u003c\/h3\u003e\n\u003cul class=\"sbe-pd-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSleepers who like a firm bed.\u003c\/strong\u003e If your current mattress feels like it gives too much, this is the one to choose. Supportive first, cushioned second.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBack and stomach sleepers.\u003c\/strong\u003e The firm spring core keeps the spine level rather than letting the hips drop below the shoulders.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCouples.\u003c\/strong\u003e Each spring moves on its own, so one person turning over does not roll the other. The reinforced border also means you can use the full width without the edge collapsing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarm sleepers.\u003c\/strong\u003e The gel infused top layer moves heat away from the surface, so it sleeps cooler than a standard memory foam mattress.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"sbe-pd-note\"\u003ePrefer a softer, more cushioning feel? The \u003ca href=\"\/products\/serenity-1000-soft-pocket-sprung-mattress\"\u003eSerenity 1000 Soft\u003c\/a\u003e uses the same 1,000 pocket spring core with a softer comfort layer on top. Same sizes, same price.\u003c\/p\u003e\n\n\u003ch3\u003eAlign 1000 or Serenity 1000?\u003c\/h3\u003e\n\u003ctable class=\"sbe-pd-table sbe-pd-table--compare\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003eAlign 1000 Firm\u003c\/th\u003e\n\u003cth\u003eSerenity 1000 Soft\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFeel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eFirm, orthopaedic\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eSoft, cushioning\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eBack and stomach sleepers, anyone who finds soft beds unsupportive\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eSide sleepers, anyone who finds firm beds too hard\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSprings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003e1,000 firm orthopaedic pocket springs\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003e1,000 FlexCore pocket springs\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComfort layer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003e2 cm gel memory foam + 4 cm supportive Flex Comfort Foam\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003e2 cm gel memory foam + 4 cm soft Flex Comfort Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eApprox. 25 cm\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eApprox. 25 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eDouble, King Size\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eDouble, King Size\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow it is built\u003c\/h3\u003e\n\u003cul class=\"sbe-pd-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 cm quilted cooling gel memory foam.\u003c\/strong\u003e The top layer moulds gently to your shape and relieves pressure at the hips and shoulders. Gel infusion draws heat away from the surface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4 cm supportive Flex Comfort Foam.\u003c\/strong\u003e A balanced cushioning layer between the memory foam and the springs, so you feel support rather than individual coils.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e16 cm of 1,000 firm orthopaedic pocket springs.\u003c\/strong\u003e Each spring sits in its own fabric pocket and responds to your weight independently. This is what gives the Align 1000 its targeted support and low motion transfer.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReinforced Flex Support Border.\u003c\/strong\u003e A firm perimeter that keeps the mattress stable edge to edge, so sitting on the side or sleeping near it does not feel like a drop.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 cm firm Flex Support Foam base.\u003c\/strong\u003e A dense foundation layer that keeps the springs level on any standard bed base.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTotal depth is approximately 25 cm. The mattress is FIRA tested.\u003c\/p\u003e\n\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable class=\"sbe-pd-table sbe-pd-table--spec\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eFeel\u003c\/th\u003e\n\u003ctd\u003eFirm, orthopaedic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSprings\u003c\/th\u003e\n\u003ctd\u003e1,000 individually pocketed orthopaedic springs, 16 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eComfort layers\u003c\/th\u003e\n\u003ctd\u003e2 cm quilted cooling gel memory foam, 4 cm supportive Flex Comfort Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBase\u003c\/th\u003e\n\u003ctd\u003e3 cm firm Flex Support Foam, reinforced Flex Support Border\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDepth\u003c\/th\u003e\n\u003ctd\u003eApprox. 25 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSizes\u003c\/th\u003e\n\u003ctd\u003eDouble 135 × 190 cm, King Size 150 × 200 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTesting\u003c\/th\u003e\n\u003ctd\u003eFIRA tested\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDelivery\u003c\/th\u003e\n\u003ctd\u003eIn stock. Free delivery across England, Wales and Scotland, normally within 3 to 4 days\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eReturns\u003c\/th\u003e\n\u003ctd\u003e14 days to return or exchange from the day after delivery, plus a 48 hour cooling off period after ordering. See our \u003ca href=\"\/policies\/refund-policy\"\u003ereturns policy\u003c\/a\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCare\u003c\/th\u003e\n\u003ctd\u003eUse a fitted sheet or mattress protector. Rotate head to foot every few months so the comfort layers wear evenly. Spot clean only.\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cdiv class=\"sbe-pd-faq\"\u003e\n  \u003cp class=\"sbe-pd-q\"\u003eHow firm is the Align 1000?\u003c\/p\u003e\n  \u003cp\u003eFirm. It is our orthopaedic option, so the spring core is tensioned to hold you level rather than let you sink. The 2 cm layer of gel memory foam on top softens the surface enough to be comfortable without changing the overall firm feel. If you want a softer bed, choose the Serenity 1000 instead.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eIs a firm mattress better for back pain?\u003c\/p\u003e\n  \u003cp\u003eMany people with back discomfort find a firmer, more supportive surface helps because it keeps the spine level through the night. The pocket springs in the Align 1000 support each part of the body separately, which is why it is described as orthopaedic. If you have a specific medical condition, ask your GP or physiotherapist what they recommend.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eWill it fit my bed frame?\u003c\/p\u003e\n  \u003cp\u003eThe Double is a standard UK double at 135 × 190 cm and the King Size is a standard UK king at 150 × 200 cm, so it fits any standard UK bed frame or divan of the same size. Check your frame's internal measurement if you are unsure.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eCan I use this mattress in my sofa bed?\u003c\/p\u003e\n  \u003cp\u003eNo. At around 25 cm deep it is a mattress for a bed, not a folding sofa bed mechanism. If you want a more comfortable sofa bed, add our \u003ca href=\"\/products\/memory-foam-mattress-topper\"\u003eCool Gel Memory Foam Topper\u003c\/a\u003e, which is cut to the sleeping areas of our sofa beds and lifts off when you fold the bed away.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eDoes memory foam sleep hot?\u003c\/p\u003e\n  \u003cp\u003eStandard memory foam can. The top layer of the Align 1000 is gel infused, which moves heat away from the surface, and it sits over a sprung core rather than a solid foam block, so air moves through the mattress far more freely than in an all foam mattress.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eWill I feel my partner moving?\u003c\/p\u003e\n  \u003cp\u003eMuch less than on an open coil mattress. Each of the 1,000 springs is in its own pocket and compresses on its own, so movement on one side does not travel across the bed.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eDoes it need turning?\u003c\/p\u003e\n  \u003cp\u003eRotate it head to foot every few months so the comfort layers settle evenly. A fitted sheet or mattress protector will keep the quilted cover clean.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eHow quickly will it arrive, and is delivery free?\u003c\/p\u003e\n  \u003cp\u003eBoth mattresses are held in stock, so delivery normally takes 3 to 4 days from your order. Delivery is free across England, Wales and Scotland, and we will contact you to arrange a delivery day. Questions before you order? Call us free on 0800 368 8914.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n","brand":"SofaBedExpert.co.uk","offers":[{"title":"Standard Double Size (135cm x 190cm)","offer_id":56227379216769,"sku":"SBE-ALI-1058-STA","price":399.0,"currency_code":"GBP","in_stock":true},{"title":"Standard King Size (150cm x 200cm)","offer_id":56227379249537,"sku":"SBE-ALI-1059-STA","price":499.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0341\/8675\/6232\/files\/WhatsAppImage2026-09-05at17.21.16.jpg?v=1788641183"},{"product_id":"serenity-1000-soft-pocket-sprung-mattress","title":"Serenity 1000 Soft Gel Memory Foam Mattress","description":"\u003cdiv class=\"sbe-pd\"\u003e\n\u003ch2\u003eSoft, cushioning comfort with real pocket spring support underneath\u003c\/h2\u003e\n\u003cp class=\"sbe-pd-lead\"\u003eSink into the surface, not into the bed: a soft Flex Comfort layer and cooling gel memory foam over 1,000 FlexCore pocket springs.\u003c\/p\u003e\n\n\u003cp\u003eThe Serenity 1000 is our softer mattress, built for people who find a firm bed too hard on the hips and shoulders. A 4 cm layer of soft, cushioning Flex Comfort Foam sits under a quilted layer of cooling gel memory foam, so the surface gently moulds to your shape the moment you lie down. Beneath it, 1,000 individually pocketed FlexCore springs do the real work: each one responds to your weight on its own, so the support stays precise however you sleep, and one person turning over does not disturb the other.\u003c\/p\u003e\n\n\u003cp class=\"sbe-pd-note\"\u003e\u003cstrong\u003eWhy a sofa bed company makes mattresses.\u003c\/strong\u003e For years customers have told us their Sofa Bed Expert sofa bed is more comfortable than the bed upstairs, and asked whether we could make a mattress for a proper bed. The Serenity 1000 and its firmer sister, the \u003ca href=\"\/products\/align-1000-firm-orthopaedic-mattress\"\u003eAlign 1000\u003c\/a\u003e, are the answer. \u003ca href=\"\/collections\/mattresses\"\u003eRead the full story\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWho the Serenity 1000 is for\u003c\/h3\u003e\n\u003cul class=\"sbe-pd-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSide sleepers.\u003c\/strong\u003e Lying on your side puts your weight on two narrow points, the hip and the shoulder. The soft comfort layer lets them settle in while the springs keep your spine in line.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnyone who finds firm beds too hard.\u003c\/strong\u003e If you wake with sore pressure points on a firm or orthopaedic mattress, this is the one to choose. Cushioning first, support a close second.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCouples.\u003c\/strong\u003e Each spring moves on its own, so movement stays on one side of the bed. The reinforced border means you can use the full width without the edge collapsing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWarm sleepers.\u003c\/strong\u003e Gel infused memory foam moves heat away from the surface, and the sprung core lets air move through the mattress, so it sleeps cooler than an all foam mattress.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"sbe-pd-note\"\u003ePrefer a firmer, more supportive feel? The \u003ca href=\"\/products\/align-1000-firm-orthopaedic-mattress\"\u003eAlign 1000 Firm Orthopaedic\u003c\/a\u003e uses the same 1,000 pocket spring core with a firmer comfort layer and base. Same sizes, same price.\u003c\/p\u003e\n\n\u003ch3\u003eSerenity 1000 or Align 1000?\u003c\/h3\u003e\n\u003ctable class=\"sbe-pd-table sbe-pd-table--compare\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e \u003c\/th\u003e\n\u003cth\u003eSerenity 1000 Soft\u003c\/th\u003e\n\u003cth\u003eAlign 1000 Firm\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFeel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eSoft, cushioning\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eFirm, orthopaedic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eSide sleepers, anyone who finds firm beds too hard\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eBack and stomach sleepers, anyone who finds soft beds unsupportive\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSprings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003e1,000 FlexCore pocket springs\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003e1,000 Firm Ortho pocket springs\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComfort layer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003e2 cm gel memory foam + 4 cm soft Flex Comfort Foam\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003e2 cm gel memory foam + 4 cm supportive Flex Comfort Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDepth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eApprox. 25 cm\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eApprox. 25 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Serenity 1000 Soft\"\u003eDouble, King Size\u003c\/td\u003e\n\u003ctd data-label=\"Align 1000 Firm\"\u003eDouble, King Size\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow it is built\u003c\/h3\u003e\n\u003cul class=\"sbe-pd-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 cm quilted cooling gel memory foam.\u003c\/strong\u003e Memory foam infused with cooling gel and quilted into the cover, so it moulds to your natural body contours and draws heat away from the surface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4 cm soft Flex Comfort Foam.\u003c\/strong\u003e The layer that gives the Serenity its gentle, enveloping feel and takes the pressure off hips and shoulders.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e16 cm of 1,000 FlexCore pocket springs.\u003c\/strong\u003e Each spring sits in its own fabric pocket and responds to your weight independently, for precise support and low motion transfer.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReinforced Flex Support Border.\u003c\/strong\u003e A firm perimeter built for corner to corner support, so sitting on the side or sleeping near the edge does not feel like a drop.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 cm Flex Support Foam base.\u003c\/strong\u003e A dense foundation layer that keeps the springs level on any standard bed base and adds that extra level of support.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTotal depth is approximately 25 cm. The mattress is FIRA tested.\u003c\/p\u003e\n\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable class=\"sbe-pd-table sbe-pd-table--spec\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eFeel\u003c\/th\u003e\n\u003ctd\u003eSoft, cushioning\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSprings\u003c\/th\u003e\n\u003ctd\u003e1,000 individually pocketed FlexCore springs, 16 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eComfort layers\u003c\/th\u003e\n\u003ctd\u003e2 cm quilted cooling gel memory foam, 4 cm soft Flex Comfort Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBase\u003c\/th\u003e\n\u003ctd\u003e3 cm Flex Support Foam, reinforced Flex Support Border\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDepth\u003c\/th\u003e\n\u003ctd\u003eApprox. 25 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSizes\u003c\/th\u003e\n\u003ctd\u003eDouble 135 × 190 cm, King Size 150 × 200 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTesting\u003c\/th\u003e\n\u003ctd\u003eFIRA tested\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDelivery\u003c\/th\u003e\n\u003ctd\u003eIn stock. Free delivery across England, Wales and Scotland, normally within 3 to 4 days\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eReturns\u003c\/th\u003e\n\u003ctd\u003e14 days to return or exchange from the day after delivery, plus a 48 hour cooling off period after ordering\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cdiv class=\"sbe-pd-faq\"\u003e\n  \u003cp class=\"sbe-pd-q\"\u003eHow soft is the Serenity 1000 mattress?\u003c\/p\u003e\n  \u003cp\u003eSoft, but not saggy. The 4 cm soft Flex Comfort layer and the quilted gel memory foam let you sink into the surface, while the 1,000 FlexCore pocket springs underneath keep the support precise. If you want a firmer feel, choose the Align 1000, which uses the same spring core with a firmer comfort layer.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eIs a soft mattress bad for your back?\u003c\/p\u003e\n  \u003cp\u003eNot if the support underneath is right. The Serenity 1000 is soft on the surface and sprung beneath, so your spine is still held in line while your hips and shoulders settle into the comfort layer. Side sleepers in particular often find this more comfortable than a firm mattress. Anyone with a specific medical condition should ask their GP or physiotherapist what they recommend.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eWhat sizes does the Serenity 1000 come in, and will it fit my bed frame?\u003c\/p\u003e\n  \u003cp\u003eTwo standard UK sizes: Double 135 × 190 cm and King Size 150 × 200 cm. Both fit any standard UK bed frame or divan base of the same size. Check your frame's internal measurement if you are unsure.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eCan I use this mattress in my sofa bed?\u003c\/p\u003e\n  \u003cp\u003eNo. At around 25 cm deep it is a mattress for a bed, not for a folding sofa bed mechanism. If you want a more comfortable sofa bed, add our \u003ca href=\"\/products\/memory-foam-mattress-topper\"\u003eCool Gel Memory Foam Topper\u003c\/a\u003e, which is cut to the sleeping areas of our sofa beds and lifts off when you fold the bed away.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eDoes memory foam sleep hot?\u003c\/p\u003e\n  \u003cp\u003eStandard memory foam can. The top layer of the Serenity 1000 is gel infused, which moves heat away from the surface, and it sits over a sprung core rather than a solid foam block, so air moves through the mattress far more freely than in an all foam mattress.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eWill I feel my partner moving?\u003c\/p\u003e\n  \u003cp\u003eMuch less than on an open coil mattress. Each of the 1,000 springs is in its own pocket and compresses on its own, so movement on one side does not travel across the bed.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eDoes it need turning?\u003c\/p\u003e\n  \u003cp\u003eRotate it head to foot every few months so the comfort layers settle evenly. A fitted sheet or mattress protector will keep the quilted cover clean.\u003c\/p\u003e\n\n  \u003cp class=\"sbe-pd-q\"\u003eHow quickly will it arrive, and is delivery free?\u003c\/p\u003e\n  \u003cp\u003eBoth mattresses are held in stock, so delivery normally takes 3 to 4 days from your order. Delivery is free across England, Wales and Scotland, and we will contact you to arrange a delivery day. Questions before you order? Call us free on 0800 368 8914.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n","brand":"SofaBedExpert.co.uk","offers":[{"title":"Standard Double Size (135cm x 190cm)","offer_id":56227379708289,"sku":"SBE-SER-1060-STA","price":399.0,"currency_code":"GBP","in_stock":true},{"title":"Standard King Size (150cm x 200cm)","offer_id":56227379741057,"sku":"SBE-SER-1061-STA","price":499.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0341\/8675\/6232\/files\/WhatsAppImage2026-09-05at17.21.16_f78bcd27-976c-47c0-919d-4b4ab5027350.jpg?v=1788641577"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0341\/8675\/6232\/collections\/WhatsAppImage2026-09-05at17.21.16.jpg?v=1789552466","url":"https:\/\/sofabedexpert.co.uk\/collections\/mattresses\/firm.oembed","provider":"SofaBedExpert.co.uk","version":"1.0","type":"link"}