Egg crate foam mattress overlay reduces pressure to help prevent pressure sores Offers a cool, dry and comfortable surface for restful sleep. Improves circulation by distributing weight evenly. Roller compressed packaging ensures compact shipping container. Please allow 1- 2 weeks for full expansion. Greener choice - New green technology provides comfortable, quality foam from plant-based material instead of depending on 100% petroleum. 1.2 density foam leaves a 25% smaller environmental footprint than conventional foam material manufacturing.