Office Beauty Soft Hip Push Up Chair Seat Cushion Yoga Pad Special designed for well shaped your hip when you work or study. Can help reduce back pain& ease strain and weariness. Weight: about 125g Measurement: 40*34*5.5cm Material: Surface: 80% cotton, 20% polyester; bottom: 100% polyester; upper layer: low rebound material; lower layer: urethane film; humps: cotton polyester, polypropylene