Ergonomic Design - The Air Cushion relieve pain and support your lumbar and tailbone, take the pressure off your spine. Orthopedic doctor recommended for hemorrhoid treatment, coccyx and tailbone pain, child birth, prostatitis. 9 Ventilated Loops and Contoured Structure.- Designed with 9 loops, contrast airflow circulating system, keep breathable, comfy and cradle your buttocks. The ergonomic contoured structure shape is designed to evenly distribute weight and promote proper posture and spine alignment. Breathable and Comfortable Anti-bacterial Materials - Made of durable and premium suede and PVC, easier to release the dissipate heat in summer and keep temperature in winter, easy to clean, quick to dry, provide comfortable seating. Inflate and Deflate Freely - Designed with flexible air valve, adjust the proper air to fit your demand of seat. Convenient to take out and storage when deflated. The valve is hidden without heaving against your haunch. Durable Air Sealing Technology - With inflatable seat cushion, you will never worry about the air leaking, adopted double thermoform sealing technology the cushion edge not only sealed well but also smooth enough and will not hurt anyone.