Brand: IKSTAR Features: Washable, Non-slip, Breathable Color: Black Size: 38cm x 45cm Material: Memory Foam Shape: Butterfly [Recommended for those who sit for long periods] Sitting for long hours can put a significant strain on your lower back and other areas. This chair cushion uses high-quality memory foam to effectively distribute pressure on the buttocks, providing excellent comfort. The three-dimensional structure supports and cradles the buttocks, making it a comfortable low-rebound cushion even for extended periods. [Three-dimensional design that cradles and supports the buttocks] The slight indentation and the sides naturally fit the buttocks, distributing pressure. [W-shaped design at the front] The sides effectively absorb pressure from the buttocks. It naturally conforms to the buttocks, gently cradling them for a perfect fit. [U-shaped design at the rear] The unique U-shaped structure avoids sensitive areas like the tailbone, improving upon the shortcomings of conventional cushions that can compress the coccyx. It reduces pressure on the tailbone from a seated position, gently caring for the coccyx and providing a comfortable sitting experience. Furthermore, this unique design improves the cushion's breathability, making it less prone to stuffiness even when sitting for long periods. The above is a description of the product. I purchased this to use while driving a car when I had lower back pain, but I stopped using it after a few times, so I am selling it. Notes: ・There are no visible stains, but please refrain from purchasing if you are concerned. ・When shipping, I will fold the cushion in half due to size constraints. Please read the above and thank you for your understanding.