The new generation of sleep design is memory foam. This 3" King Size Memory Foam Mattress Pad features a 4 lb density. Whether you want to add a layer of shape conforming comfort to your existing bed or protect a new mattress the viscoelastic properties of slow-recovery memory foam will help reduce pressure points giving you a restful night's sleep. Made of visco elastic memory foam, these mattress pads are temperature sensitive to mold to your body shape. The 100% hypoallergenic foam mattress will allow you to enjoy the best sleep of your life. Made in the USA. Please Note: Due to the possibility of health risks, this item cannot be returned. .