A viscoelastic (memory) foam sheet — 50 kg/m³ density, soft 55 Newton firmness, Crib 5 fire rated, cut in the UK. Supplied as a 150 x 200cm sheet in thicknesses from 1" to 4". Memory foam softens in response to body heat, moulds to your shape, then recovers slowly. It is normally used as a comfort layer on top of a firmer support foam rather than on its own. A common build is a 3"–4" firm support foam with a 1"–2" memory layer on top: the support foam holds you up, the memory foam relieves pressure points. Specifications Foam grade 55M (VC50/55) Foam type Viscoelastic (memory) polyurethane — also called low-resilience foam Density 50 kg/m³ Firmness 55 Newtons (ILD at 40% compression) — soft feel Fire behaviour Crib 5 (BS 5852 Ignition Source 5) Colour White Sheet size 150 x 200cm (59" x 78.7") Thicknesses 1", 1.5", 2", 3", 4" Manufactured United Kingdom What memory foam is for Mattress toppers — the most common use. 2" is typical; 1" adds a light comfort layer. Pressure relief — why it is widely used in medical and care settings. Cushion and pillow comfort layers, on top of a firmer foam. Caravan and campervan bed cushions, as a top layer over firm support foam. Questions about this foam Can I use memory foam on its own for a seat or mattress? Not usually recommended. Memory foam is a comfort layer, not a support layer. Used alone at a normal cushion thickness it will let you sink through to the base, because it does not provide structural support. Pair it with a firm support foam underneath. Why is it soft at 55N but also the densest foam you sell? Because density and firmness measure different things. At 50 kg/m³ this is one of our densest foams — which is why it is durable and feels substantial. Its 55N rating means it yields easily under pressure. Density predicts lifespan; firmness predicts feel. They move independently. Why does memory foam feel firmer in a cold room? It is thermo-sensitive by design. It softens as it warms to body temperature, so it can feel noticeably firmer for the first minute or two in a cold room, then softer once you have been lying on it. This is normal and is worth knowing if you are fitting out an unheated caravan or campervan. For the full explanation of density, firmness and fire ratings, see our foam FAQs. To compare every grade side by side, see our foam grade comparison. Cut to order in our own UK factory. Next working day delivery is available to most of the UK — see our delivery page for timings to your area.
