Thank you for viewing! ☺︎ I purchased this about two years ago, but I don't use it much, so I'm selling it. ↓↓ The following is a product description ↓↓ A sitting experience like floating on water. It's less likely to cause pain in your tailbone even after prolonged use. The three-dimensional structure prevents sinking. No bottoming-out feeling. Double-sided honeycomb gel structure, usable on both sides. Good breathability and less stuffiness. Reduces body strain by distributing pressure. ・Material: Main body: TPE (Thermoplastic Elastomer) 　　　　 Cover: 100% polyester ・Product size: 40 x 37 x 4cm when the cover is attached ・Set contents: Main body, cover Gel cushion Lower back pain relief Lower back pain goods Sciatica