The Convoluted Comfort overlay is made from high-quality, combustion-modified polyurethane foam. Available in a wide range of peak and base heights and foam densities to address different levels of surface discomfort. This 'eggcrate' overlay is considered effective as a comfort measure only. All pads are 72"L x 34"W and are compression rolled for efficient storage.This item cannot be returned or exchanged once they are opened due to hygienic reasons.