This is a bed chair. It doesn't slide backward because it's designed to support your bottom. I bought it for my bedridden mother, but it became unusable because we switched to an air mattress. It's not suitable for air mattresses. It has armrests, so it's also recommended for those who have difficulty sitting properly, such as when using a foot bath. I purchased it for about 12,000 yen. Used twice for a short time. - Size: 58cm x 25cm x 10cm (Width x Depth x Height) - Weight: 1.9kg - Adjustment: 6-step adjustment - Materials: Steel, Plastic, Polyester Thank you for looking.