Mattress description:(1) Totally height: 26cm(2) Quantity in 40"HQ: K(420pcs); Q(490pcs); F(560pcs); T(770pcs)(3) High quality knitted fabric.It is improted from Germany, environment and strong breathability, dust resistant, anti-mite function, no static electricity. Safe and health, soft and comfortable, green environmental protection standards.(4) Memory foam: 5cm.This foam is sensitive to the heat and pressure of human to automatically adjust to body weight and temperature; it"memorises" them. It conforms to the curves of the body, relieving not only critical pressure points, but aches and pains that can accumulate throughtout the working days. Also reduces the effects of tossing or turning from a sleeping partner.(5) Pocket spring: 18.5cm, Ø2.0.The pocket spring in the top is supported independent, compressed and resilience party. No disturb, reduce friction, minimize noise; enhance resilience, support perfectly. The body with mattress is entirely fitting, support the vertebrae, keep the body comfort and smooth.(6) ISO 9001 : 2000(7) 15 years guarantee(8)BS 7177 FR Standard Test