【Comfort Like Never Before】Extra Thick Rollaway Mattress Features Hybrid Design for amazing comfort on any hard surface or floor. It conforms to the curves of your body to relieve pressure and pain. The gel-infused memory foam and mesh sides will be more breathable, and keep your body from overheating easily, maintain a cooler constant temperature. 【Lying Feel Seamless】We recommend that you sleep with your upper body on one end of the seam at the top of the mattress and your legs on the other end, the parts where folds dosen't feel like there's a gap.Before first use, leave the foam flatly in a well ventilated area for 48-72 hours until it's fully expanded.Memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state. 【Medium Firm】The 6-inch tri-fold mattress is constructed of 2 inch Gel-Infused memory foam over a 4 inch supportive foam base for a great sleep experience. You won't sink whatever you are side sleeper and back sleeper.Sleep like as the regular bed for an extended period.And the bottom foam is very supportive,side sleepers won't worry hips/shoulders bottomed out.