{"title":"Mattress \u0026 Memory Foam","description":"\u003cp\u003e\u003cstrong\u003eFoam for mattresses and mattress toppers, cut to order in our UK factory.\u003c\/strong\u003e All grades here are Crib 5 fire rated.\u003c\/p\u003e\n\n\u003ch2\u003eA mattress needs two layers, not one\u003c\/h2\u003e\n\u003cp\u003eThis is the thing most people get wrong when they build or repair a mattress.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMemory foam is a comfort layer, not a support layer.\u003c\/strong\u003e Used on its own at a normal mattress thickness, it will let you sink through to the base — it does not provide structural support, and it was never designed to. What it does brilliantly is relieve pressure points once something firmer is holding you up.\u003c\/p\u003e\n\u003cp\u003eThe build that works:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport layer\u003c\/strong\u003e — a firm, high density foam, typically 3\"–4\". This carries your weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfort layer\u003c\/strong\u003e — \u003ca href=\"\/products\/memory-foam-sheet-55m-vc50-55\"\u003ememory foam\u003c\/a\u003e, typically 1\"–2\" on top. This moulds to your shape.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhich foams\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eLayer\u003c\/th\u003e\n\u003cth\u003eProduct\u003c\/th\u003e\n\u003cth\u003eDensity\u003c\/th\u003e\n\u003cth\u003eFirmness\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eComfort \/ topper\u003c\/td\u003e\n\u003ctd\u003eMemory Foam 55M\u003c\/td\u003e\n\u003ctd\u003e50 kg\/m³\u003c\/td\u003e\n\u003ctd\u003e55N — soft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirm support\u003c\/td\u003e\n\u003ctd\u003e33H\u003c\/td\u003e\n\u003ctd\u003e33 kg\/m³\u003c\/td\u003e\n\u003ctd\u003e190N — hard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGeneral support\u003c\/td\u003e\n\u003ctd\u003e35H Universal\u003c\/td\u003e\n\u003ctd\u003e35 kg\/m³\u003c\/td\u003e\n\u003ctd\u003eSee product page\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy memory foam is soft AND our densest foam\u003c\/h2\u003e\n\u003cp\u003eAt 50 kg\/m³ the memory foam is the densest foam we sell, yet at 55N it is also the softest. That is not a contradiction — it is the clearest possible demonstration that density and firmness are separate properties. Density is how much material is in the foam, and it predicts durability. Firmness is how easily it compresses, and it predicts feel. High density does not mean firm.\u003c\/p\u003e\n\n\u003cp\u003eSee our \u003ca href=\"\/pages\/upholstery-foam-sheets-faqs\"\u003efoam FAQs\u003c\/a\u003e for the full explanation, or compare every grade in our \u003ca href=\"\/pages\/foam-grade-comparison\"\u003efoam grade comparison\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"average-high-density-hard-foam-sheet-33h-v33h-rx33-190","title":"Medium Firm Sofa Cushion Foam Sheet 35M — 35kg\/m³ High Density, Crib 5 (V36F \/ RX36\/125)","description":"\u003cp\u003e\u003cstrong\u003eA medium-firm, high density upholstery foam sheet — the standard choice for replacing collapsed sofa and chair seat cushions. 35 kg\/m³ density, 125 Newton firmness, Crib 5 fire rated, cut in the UK.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis is the grade most people want when a sofa cushion has gone soft and you can start to feel the frame beneath you. It is especially suited to replacing fibre-filled cushions, which flatten quickly and do not recover their shape. It gives a supportive sit without feeling hard.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eFoam grade\u003c\/th\u003e\n\u003ctd\u003e35M (V36F – RX36\/125)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDensity\u003c\/th\u003e\n\u003ctd\u003e35 kg\/m³ (high density)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFirmness\u003c\/th\u003e\n\u003ctd\u003e125 Newtons (ILD at 40% compression) — medium feel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFire behaviour\u003c\/th\u003e\n\u003ctd\u003eCrib 5 (BS 5852 Ignition Source 5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColour\u003c\/th\u003e\n\u003ctd\u003eBeige white\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolyurethane foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSheet sizes\u003c\/th\u003e\n\u003ctd\u003e230 x 200cm (90.5\" x 78.7\") · 230 x 100cm (90.5\" x 39.3\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThicknesses\u003c\/th\u003e\n\u003ctd\u003e1\/2\", 1\", 1.5\", 2\", 3\", 4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufactured\u003c\/th\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat this foam is for\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSofa seat cushions\u003c\/strong\u003e — the most common use. Medium firmness suits everyday sitting.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eChair and armchair cushions\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacing fibre-filled cushions\u003c\/strong\u003e — fibre flattens and stays flat; foam recovers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eWindow seats and bench pads\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWant a firmer sit? See the \u003ca href=\"\/products\/average-high-density-hard-foam-sheet-33h-v33h-rx33-190\"\u003e33H\u003c\/a\u003e (190N) or \u003ca href=\"\/products\/luxury-high-density-hard-foam-sheet-39h-v38-rx39-200\"\u003e39H\u003c\/a\u003e (200N). Want the same medium feel but longer-lasting? See the \u003ca href=\"\/products\/luxury-high-density-medium-foam-sheet-41m-reflex-400-h-rx41-150\"\u003eLuxury 41M\u003c\/a\u003e (41 kg\/m³, 150N).\u003c\/p\u003e\n\n\u003ch2\u003eQuestions about this foam\u003c\/h2\u003e\n\n\u003ch3\u003eDoes 35 kg\/m³ mean this foam is firm?\u003c\/h3\u003e\n\u003cp\u003eNo — density and firmness are different things. Density (kg\/m³) tells you how much material is in the foam, which predicts how long it lasts. Firmness (Newtons) tells you how it feels to sit on. This foam is 35 kg\/m³ and 125N. Our 39S is \u003cem\u003edenser\u003c\/em\u003e at 39 kg\/m³ but \u003cem\u003esofter\u003c\/em\u003e at 120N. Higher density does not mean firmer.\u003c\/p\u003e\n\n\u003ch3\u003eHow thick should my sofa cushion foam be?\u003c\/h3\u003e\n\u003cp\u003eMeasure the internal depth of the existing cushion cover, not the old collapsed foam — a worn cushion has compressed and will under-measure. Sofa and chair seat cushions are typically 4\"–6\".\u003c\/p\u003e\n\n\u003ch3\u003eWhat does Crib 5 mean?\u003c\/h3\u003e\n\u003cp\u003eCrib 5 is BS 5852 Ignition Source 5 — the UK furniture fire test required for contract and commercial seating. It is a different standard from Class 0, which is a building regulations rating for walls and ceilings, not furniture. Note that BS 5852 is a composite test: certification applies to the foam and cover fabric together, so the finished cushion’s compliance also depends on the fabric you use with it.\u003c\/p\u003e\n\n\u003cp\u003eFor the full explanation of density, firmness and fire ratings, see our \u003ca href=\"\/pages\/upholstery-foam-sheets-faqs\"\u003efoam FAQs\u003c\/a\u003e. To compare every grade side by side, see our \u003ca href=\"\/pages\/foam-grade-comparison\"\u003efoam grade comparison\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eCut to order in our own UK factory. Next working day delivery is available to most of the UK — see our \u003ca href=\"\/pages\/upholstery-foam-sheets-uk-delivery\"\u003edelivery page\u003c\/a\u003e for timings to your area.\u003c\/p\u003e","brand":"Upholstery Foam Sheets","offers":[{"title":"230 x 200cm  (90.5\" x 78.7\") \/ 1\/2\"","offer_id":46340473042,"sku":"","price":44.49,"currency_code":"GBP","in_stock":true},{"title":"230 x 200cm  (90.5\" x 78.7\") \/ 1\"","offer_id":46340473106,"sku":"","price":76.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 200cm  (90.5\" x 78.7\") \/ 1.5\"","offer_id":46340473170,"sku":"","price":107.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 200cm  (90.5\" x 78.7\") \/ 2\"","offer_id":46340473234,"sku":"","price":133.49,"currency_code":"GBP","in_stock":true},{"title":"230 x 200cm  (90.5\" x 78.7\") \/ 3\"","offer_id":46340473298,"sku":"","price":194.49,"currency_code":"GBP","in_stock":true},{"title":"230 x 200cm  (90.5\" x 78.7\") \/ 4\"","offer_id":46340473362,"sku":"","price":255.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 100cm  (90.5\" x 39.3\") \/ 1\/2\"","offer_id":46340473490,"sku":"","price":27.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 100cm  (90.5\" x 39.3\") \/ 1\"","offer_id":46340473554,"sku":"","price":44.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 100cm  (90.5\" x 39.3\") \/ 1.5\"","offer_id":46340473618,"sku":"","price":59.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 100cm  (90.5\" x 39.3\") \/ 2\"","offer_id":46340473682,"sku":"","price":76.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 100cm  (90.5\" x 39.3\") \/ 3\"","offer_id":46340473746,"sku":"","price":107.99,"currency_code":"GBP","in_stock":true},{"title":"230 x 100cm  (90.5\" x 39.3\") \/ 4\"","offer_id":46340473810,"sku":"","price":133.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2277\/6099\/products\/upholstery-foam-sheet-gb-33h-v33h-rx33-190.jpg?v=1508489262"},{"product_id":"memory-foam-sheet-55m-vc50-55","title":"Memory Foam Sheet – 55M VC50\/55","description":"\u003cp\u003eAlso referred to as “visoelastic” polyurethane foam or low-resilience polyurethane foam, our \u003ca href=\"https:\/\/www.gbfoamdirect.co.uk\/foam-cut-to-size\/memory-foam\/\" target=\"_blank\" title=\"Memory Foam\" rel=\"noopener noreferrer\"\u003eMemory Foam\u003c\/a\u003e Sheets provide exceptional levels of comfort and support.\u003c\/p\u003e\n\u003cp\u003eDesigned to effectively mould to a user’s unique body shape, memory foam seemingly melts around any pressure that is applied to it. This is because memory foam softens as it reacts to body heat temperatures.\u003c\/p\u003e\n\u003cp\u003eMemory foam sheets are perfect for adding extra levels of comfort and support to cushions, pillows, and mattresses. They can be used in conjunction with other foam types to add additional comfort when required. \u003c\/p\u003e\n\u003ch2\u003eMemory Foam Sheet – VC50\/55 Specifications:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSoft Feel Foam\u003c\/li\u003e\n\u003cli\u003eColour - White\u003c\/li\u003e\n\u003cli\u003eDensity - 50 (Kg\/m\u003csup\u003e3\u003c\/sup\u003e)\u003c\/li\u003e\n\u003cli\u003eILD 40% Newton\u003csup\u003e(3)\u003c\/sup\u003e (Indentation Load Deflection) - 55\u003c\/li\u003e\n\u003cli\u003eFire Behaviour - Crib V\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Upholstery Foam Sheets","offers":[{"title":"150 x 200cm  (59\" x 78.7\") \/ 1\"","offer_id":46344033362,"sku":"","price":52.22,"currency_code":"GBP","in_stock":true},{"title":"150 x 200cm  (59\" x 78.7\") \/ 1.5\"","offer_id":46344033426,"sku":"","price":103.92,"currency_code":"GBP","in_stock":true},{"title":"150 x 200cm  (59\" x 78.7\") \/ 2\"","offer_id":46344033490,"sku":"","price":131.97,"currency_code":"GBP","in_stock":true},{"title":"150 x 200cm  (59\" x 78.7\") \/ 3\"","offer_id":46344033554,"sku":"","price":197.97,"currency_code":"GBP","in_stock":true},{"title":"150 x 200cm  (59\" x 78.7\") \/ 4\"","offer_id":46344033618,"sku":"","price":263.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2277\/6099\/products\/upholstery-foam-sheet-gb-55m-vc50-55.jpg?v=1508495312"},{"product_id":"universal-high-density-foam-sheet-35h","title":"Universal High Density Foam Sheet 35H","description":"\u003cp\u003eThis is a universal grade of foam that is white in colour. It is a high-density foam measuring 35kg\/m3.\u003cbr\u003e\u003cbr\u003eThis universal upholstery foam sheet can be used for a range of upholstery applications including a variety of seating, bedding and other soft furnishings.\u003cbr\u003e\u003cbr\u003eGB35H (Universal High Density) Foam Sheets are a suitable alternative to a variety of our popular upholstery foam sheets. These substitutions include foam grades such as Average (High Density) Hard Foam Sheet 33H (V33H – RX33\/190), 36M and 33M (VE33 foams \u0026amp; RX33 foams).\u003c\/p\u003e\n\u003ch2\u003eUniversal High Density Foam Sheet 35H Specifications:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eColour – White\u003c\/li\u003e\n\u003cli\u003eDensity – 35 (Kg\/m\u003csup\u003e3\u003c\/sup\u003e)\u003c\/li\u003e\n\u003cli\u003eFire Behaviour – Crib V\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Upholstery Foam Sheets","offers":[{"title":"220 x 200cm  (86.5\" x 78.7\") \/ 1\/2\"","offer_id":42830755004584,"sku":null,"price":40.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 200cm  (86.5\" x 78.7\") \/ 1\"","offer_id":42830755037352,"sku":null,"price":71.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 200cm  (86.5\" x 78.7\") \/ 1.5\"","offer_id":42830755070120,"sku":null,"price":97.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 200cm  (86.5\" x 78.7\") \/ 2\"","offer_id":42830755102888,"sku":null,"price":127.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 200cm  (86.5\" x 78.7\") \/ 3\"","offer_id":42830755135656,"sku":null,"price":186.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 200cm  (86.5\" x 78.7\") \/ 4\"","offer_id":42830755168424,"sku":null,"price":245.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 100cm  (86.5\" x 39.3\") \/ 1\/2\"","offer_id":42830755201192,"sku":null,"price":25.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 100cm  (86.5\" x 39.3\") \/ 1\"","offer_id":42830755233960,"sku":null,"price":40.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 100cm  (86.5\" x 39.3\") \/ 1.5\"","offer_id":42830755266728,"sku":null,"price":56.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 100cm  (86.5\" x 39.3\") \/ 2\"","offer_id":42830755299496,"sku":null,"price":71.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 100cm  (86.5\" x 39.3\") \/ 3\"","offer_id":42830755332264,"sku":null,"price":97.98,"currency_code":"GBP","in_stock":true},{"title":"220 x 100cm  (86.5\" x 39.3\") \/ 4\"","offer_id":42830755365032,"sku":null,"price":127.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2277\/6099\/products\/white-high-density-foam.jpg?v=1666105062"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2277\/6099\/collections\/upholstery-foam-sheet-gb-33h-v33h-rx33-190.jpg?v=1783982089","url":"https:\/\/www.upholsteryfoamsheets.co.uk\/collections\/mattress-memory-foam.oembed","provider":"Upholstery Foam Sheets","version":"1.0","type":"link"}