Cotton.SOFT COVER: The soft plush material and double temperature structure are suitable for hot and cold weather. Even if you sit and stand up for a long time, the support pillow immediately s to its original shape. The seat cushion does not deform and does not collapse..FOLDABLE DESIGN: With elastic buckle, when you don't use it, it can be folded and stored, which is very convenient to store. It features breathable fabric, which is wearable and easy to wash..CORRECTED SITTING POSTURE: The Seat Cushion Is Ergonomically Designed, Relieves Pressure On Tailbone, Hips, And Spine Help Promotes Blood Circulation, Will Relief From Lower Back Pain, Numbness And Pain From Sciatica, Herniated Discs, Tailbone Injuries, Back Pain From Pregnancy.SHAPE UP BEAUTIFUL BUTTOCK: Orthopedic siting cushion use double O-shaped hollow design to make the hip plump, even if you sit for longer, can relieve stress and shaping hip lines and S-shaped body..VERSATILE: The Seat Cushion Can Be Used Anywhere, Car, Office, Sofa, Kitchen Chair, Dinette, Travel. Applicable To Four Seasons, It Is And Not Easy To Deform. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.