... layer,overturn-free,allergy proof,spine protection design. This comfort soft mattress inner spec as below: high-density foam, menory foam, high ... keep the natural spinal alignment.3.High-density, high-elasticity, soft sponge and silken fibre with tack & jump pattern, fits body ... while travelling. fireproof material can approved CFR1633, S7177,ect. Comfort Soft Mattress