Geo-Mattress UltraMax MattressesUltra High Performance foam in high fatigue seat section; 55% higher support factor yields superior resiliency and recovery Silicone coated, shear minimizing fabric bands located on the cover's underside help prevent heels, sacrum, and scapula from "digging into" surface Protect against damaging effects of micro shear, macro shear, and rotational (pivot induced) shear Large areas of both hook and loop on bottom of mattress help in anchoring it to a