6 in. Firm Reversible Foam Mattress in a Box, Twin-Size High-Density Foam Mattress, White B011P213319Lightweight PU foam core and double sided quilting offer support and firmness Reversible design extends the lifespan of the mattress for durability High density foam ensures lasting comfort and support Provides adequate support and firmness for back or stomach sleepers Suitable for various bed frames, including platform beds, bunk beds, and trundle beds CertiPUR US certified foam ensures quality and safety. Ships compressed and rolled for easy