Self-Inflating Seat Cushion Camping Mat Portable Travel Seat Cushion Chair Pad for Hiking Fishing Office Stadium Car Bus Seats Specifications: Easy to Inflate/Deflate Easy to inflate, just leave the valve open or blow it up to your desired cushion thickness. The deflating method is to open the valve and roll it up into the storage bag. Large Size But Lightweight : Expanded size is 30*40cm but it ultralight for you to carry it anywhere in the office, park, theater, etc. Scene Application : The inflatable cushion is great for long flights or travel, hard benches, and sporting events. Waterproof : Its fabric is waterproof and not easy to pierce. It can be cleaned with a damp cloth, but it is not machine washable. Package: 1Pc xSelf-Inflating Seat Cushion