Features: The experiment proves that this seat cushion can be used for 9 hours .You don't have to worry about sitting in a place for a long time and it hurts! The 19"x19" fit just right on the airplane seat and after a 9 h, I had no back issues (from my tailbone) from sitting upright or slightly reclined !Very comfortable. Good price, great relief and not as bulky as most seat aids. It folds up into a rather small square you can toss in your purse, not much bigger than a pack of cards. You won't regret this purchase. Good product: Lightweight and easy to use, I believe you can buy more expensive cushions for a big price, but I think it is better. while a flat surface support reduces the pressure on the buttocks and sits beautifully to protectthe back. We usually spend 50% to 70% of our time sitting in our seats, whether in a wheelchair or on a hard chair, to help sit comfortably and prevent and treat stress ulcers. Uniform weight and durable materials prevent leaking air and are more comfortable than gel. Easy to fold around for travel, outdoor, gaming, learning, work. For wheelchair-users, elderly hospitals, nursing homes and home care. Material: 0.3mm PVC Color: Grey Size: approx. 19"x19" Maximum bearing weight: 200 lb