I had surgery on my buttocks and experienced pain, so I purchased a U-shaped cushion. However, it didn't fit my chair and I couldn't sit on it properly. I'm selling it as almost unused, as I only tried it out. About the product: 【U-shaped design】 The U-shape reduces pressure on the tailbone and prevents stuffiness. It's designed to reduce strain on your buttocks even when sitting for long periods. 【Reduces strain on the lower back and buttocks】 The ergonomic honeycomb structure effectively distributes body weight. I think it can be used for long hours of sitting, such as driving, desk work, and studying. *It may not be suitable for small chairs like pipe chairs. 【Durable and long-lasting】 Made with a material that has excellent durability and elasticity. It resists deformation and is economical for long-term use. 【Multi-purpose】 It can be used in two ways: placed on a chair or laid on the floor. Recommended for the elderly, pregnant women, students, drivers, etc. 【Washable and clean】 The cushion itself is washable, and the cover is removable and washable. You can keep it clean and use it with peace of mind.