Five comfort layers work together to support your lumbar spine and dull the waterâ€s motion without eliminating it altogether. This mattress is perfect for those who enjoy the motion of a waterbed but donâ€t want their sleep disturbed. 3rd most waveless Reinforced corners 24 mil vinyl Sterling S-Class Mattress Wave Control Three fiber layers provide wave-reducing stability to make it easier to fall asleep and stay asleep, but without eliminating all of the motion of a waterbed. Double Lumbar Two layers of lumbar support keep your spine in a more natural and comfortable position so you can sleep comfortably and wake up feeling rested and pain-free. Reinforced This model features an additional layer of 24 mil vinyl for increased longevity and durability, as well as reinforced corners that protect traditional waterbeds†weakest points.