Patented Leak-Proof Double-Wall Super Waveless Water Mattress with Feathertop Moulded Surface Reduces Body Pressures for Greatest Comfort Dual mattress system includes 2 Heaters and 2 Solid State Temperature Controllers so each partner can choose their own comfort level. Unique K-Rail Construction gives Best Sitting and Sleeping Edge and supports True 9" ExtraDeep Fill like wood frame waterbeds for true water support Reversible Pillowtop 3” Premium Memory Foam Pad with Organic Cotton Non-Quilted Stretch Cover Allows No Toxic Flame Retardant Chemicals Required Top Only –use your own platform bed or foundation capable of supporting a waterbed or order foundation separately or use directly on floor