Valupak Visco Elastic Memory Foam Double Mattress. Using state-of-the-art slow recovery memory foam which conforms to your body ensuring the best possible sleep every time. 25mm of Visco combined with 135mm of high density foam. Dustmite resistant & promotes good blood circulation. Machine washable zip off cover. Open celled & breathable mattress keeping you cool. This Non-turn mattress is suitable for any bed base type.