Description: 【Material】: This inflatable seat cushion for surfboards and kayaks is made of PVC, 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 sturdy 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 Dimensions】: The backrest measures 17.72"x15.75", while the seat cushion itself measures 15.75"x17.72"x4.33", providing ample support for comfortable seating during your water activities 【Package Includes】: Each package comes with 1 canoe seat cushion with back support Specification: Material: PVC Size Chart: Backrest: 45cmx40cm/17.72inchx15.75inch Base: 40cmx45cmx11cm/15.75inchx17.72inchx4.33inch Package Includes: 1 Kayak Seat with Back Support Note: Please allow slightly errors due to manual measurement and different screens.