Filling material: memory cotton. S code has a diameter of 30cm and thickness of 3cm, M code has a diameter of 35cm and has a thickness of 3.5cm, and L code has a diameter of 40cm and a thickness of 4cm. Sit and stand for a long time-a good cushion, one-piece memory foam, can absorb the pressure of the human body, adjust the sitting posture to a comfortable posture, without strong rebound, soft and not collapse, comfortable and natural. Strictly selected knitted cotton fabric, soft and skin-friendly, universal in all seasons, comfortable and breathable, not easy to pilling and fade. Slow rebound memory foam, sitting on the mat, there is no pressure on the buttocks, and the material adjusts the pressure of irregular shapes to a balanced state, creating a healthy circulation.