Rio Home Fashions 12-Inch Luxury Reversible Pillow Top Memory Foam Mattress, Twin 12-Inch reversible pillow top memory foam mattress has 1-inch premium memory foam top layer for extra comfort and a 1-inch high-resistance foam layer that provides extra cushioning that makes up the pillow top layer The zipper release top layer allows for your choice of sleeping surfaces; the soft quilted side or the smooth firm side There is then a 2-inch firm memory foam support layer on top of an 8-inch high-resistance foam base for stability and outstanding support Just flip and zip the top layer to your preference Hypoallergenic and anti-microbial materials promote a healthier night sleep