[Material]:This inflatable seat cushion for surfboards and kayaks is made of durable nylon with Eva film,offering good elasticity and sturdy stitching.It's designed to withstand the rigors of water sports [Waterproof and Sweatproof]:Our seat cushion is waterproof and sweatproof,making it durable and suitable for all your surfing or kayaking adventures [Easy Installation]:The kayak seat is easy to install and remove as needed,which is suitable for both beginners and experienced water sports enthusiasts [Product for Dimensions]:The backrest measures 45cmx36cm while the seat cushion itself measures 48cmx45cm,providing ample support for comfortable seating during your water activities [Package Includes]:Each package comes with 1 canoe seat cushion.Please note that the backrest does not come with a bag