Do you sit comfortably on a wheelchair? Inexpensive, high-performance hybrid cushion / bottom layer foam supports the body and the gel on the upper layer disperses pressure! The outer layer of urethane foam and the upper layer of gel hybrid-type cover. The special shape supports the back of the sciatica and quadric, reducing pain in the tailbone protrusion. The inner material is made of 2 layers with excellent breathability. The cover is water repellent (washable). *The gel around the sciatica area distributes the seat pressure to reduce the forward slippage of the buttock, and the gel on the back of the thigh prevents slippage and stabilizes your posture.