Convoluted Foam

Also referred to as eggcrate foam, is a polyurethane foam with uneven top surface of hills and valleys. The unique pattern provides more cushion than flat foam since the coned peaks absorb physical stress and provide for better weight distribution. The material also permits more air circulation, and many hospitals use medical grade convoluted foam as bedding material to reduce the risk of decubitus ulcers, or bedsores.