Laybrooks adjustable bed pocket memory sprung mattress are specifically designed for all types of adjustable beds the spring count depends on the size of the mattress 3ft 4ft 4ft 6 5ft or 6ft as an example a 5ft mattress has over a 1000 springs we use a very high grade visco elastic memory foam and all mattresses are made for the individual customers weight and how they like the feel soft medium or firm we use different densitys of foams to give the different firmnesses and they have a