Special flex support cushion supports your backside and spine so well, you can sit on an egg without breaking it - no other seat cushions for chairs can make that promise! unlike your memory foam desk chair, sciatic nerve pillow, or foam cushion, egg sitter's unique flex-Grip honeycomb design allows air to circulate and stays cools to the touch strong and durable, egg sitter retains its shape, making it a great back pain seat and orthopaedic seat fits most chairs for deep seat pressure relief - egg sitter measures 15-Inches x 16.5-Inches includes 1 egg sitter seat cushion and non-Slip cover.