[If you have to sit a lot and this lifting cushion helps] To relieve pressure from sitting. By flexibly adjusting the air volume, choose the hardness that suits you. [Multifunctional seat pad, keeps pressure off] If you use it on the chair, the pressure on the tailbone can be relieved and helps to correct poor sitting posture, prevents bedsores. If you use it as a back support cushion, it helps relieving pressure on sacral and lower back area. If needed, it is good for other parts of the body, neck, arms, thighs, and ankles. [Better butt support on chairs to sit on] It helps a lot while your sitting down at home, in the car, or office. After deflation, the product can be folded and stored, the best companion for business trips and travel. [Comfortable, cushiony and 0.5lb lightweight seat cushion] Size is about 17.32x14.96x3.54in, ideal for most chairs. The inner oval hollow, 7.08x6.29in, well formed a breathable area, supports the top of the leg evenly across and provides the relief in the center. [Convenientand fast inflation or deflation] There is no pump incl., but never worry about the inflation. The pillow set equipped with updated function, it only takes about 10-15 seconds to blow up. The flocking surface is easy to clean, just wipe it with a damp cloth. [Helps to correct poor sitting posture] This allows for effective pain relief and healing of the affected area. Soft and material conforms to your body for superior cushioning while resisting punctures and leaks. Holds weight up to 330 lbs. Specifications:Item Name: Donut Seat Cushion Large Tailbone PillowMaterial: Memory FoamColor: GreyShape: As pictures shownSize: 44x38x9cm or 17.32x14.96x3.54in Package List:1 or 2 or 3 or 5PcsxDoughnut Pillow Warm Tips:1.We provide you with the best product and service. s If you have any problem, please let us know, and we will solve the problem ASAP. Thank you so much.2.Due to the light and screen difference, the item's color may be slightly different from the pictures.3.Please allow slight dimension difference due to different manual measurement.4.1cm=0.39 inch.