I used to use a gel cushion for lower back pain, but it fell apart, so I bought a new one. However, it was 3cm thick, and the height didn't match my armrests or table, which made my back feel worse, so I reluctantly stopped using it and am selling it. I used a cover with it. The back of the cover has a non-slip feature. [Relaxing Home Goods] This item allows you to relax at home. It supports various sitting positions such as seiza (formal sitting), agura (cross-legged), and athletic sitting, and is suitable for people of all sizes. Perfect for protecting your floors and hard chairs. [Supreme Cushioning] The thickness provides a significant body pressure distribution effect, and the elasticity of the gel creates a sitting experience like floating on water. Your buttocks won't hurt even after sitting for long periods. It can also be used as a zabuton (Japanese floor cushion). [Non-Sticky Gel Cushion] This is a popular honeycomb structure gel cushion. The honeycomb structure has two layers, and combined with the coolness unique to the gel material, it also has excellent breathability. It's a gel cushion that's overwhelmingly less sticky compared to general cushions. [All-Season Cover Included] Comes with a summer cover and a winter cover, so both those who feel cold and those who feel hot can use it comfortably. Furthermore, the cover is removable, so it's always clean. The back has a non-slip treatment to maintain proper posture.