BEST MEMORY FOAM SEAT CUSHION: Our office chair cushions fit the shape of your hips perfectly, providing natural support with little to no pressure on your most sensitive areas. Soft yet firm, especially for those who sit for 8 hours a day. HELP RELIEF PAIN: Ergonomically designed with a "U" cutout, it provides support and comfort while relieving pressure on the lower back, coccyx, lumbar region and promoting a Y-position. Our chair cushion also helps relieve sciatica symptoms and improves blood circulation, keeping you energized all day long. FITS MOST TYPES OF CHAIRS: The lightweight chair cushion is perfect for use as a car seat cushion, gaming chair cushion, desk chair cushion, wheelchair seat cushion. It's a great travel companion for comfortable sitting wherever you go. VERSATILE COCCAL BONE CUSHION: This sciatica relief cushion features a non-slip rubber bottom to prevent slipping. Washable zippered velvet cover for easy cleaning and built-in handle for easy carrying. LARGE SIZE: Measuring 18" x 14" x 1.8", it fits most chairs. As your weight increases, the support provided by the Bomdaia coccyx seat cushion decreases. For optimal support, a weight of 230 lbs or less is recommended. LIFETIME CUSTOMER SERVICE: This office chair cushion is the perfect combination of softness and comfort. However, please allow one week for the cushion to return to its perfect appearance, and 1-3 weeks to adjust to the feel