4 3/4" thick core in 37 kg/m3 - 3,1 kPa bedding-quality CMHR Bultex, overlaid on 1 side with 2 1/4" thick viscoelastic `memory' foam (75 kg/m3 - 2,2 kPa) which moulds perfectly to the shape of the body whilst minimising the effect on the body & circulation. White stretch piqué ticking (30 % viscose / 64 % polyester / 6 % elastane). Quilting on the upper part and sides in "thermosafe" fire-retardant felt. Polyester quilting (245 g/m²) on the head and foot sections and interior, with viscoelastic foam on the exterior and sides.