??Polyester on the surface, filled with EVA inside ??Universal Paddle Board Accessories, suitable for all sizes Paddle Board. NOTE: your board must have D rings for kayak seats. ??Can also attach to Compatible kayaks, rowboats, fishing boats ??Kayak Seat Cushion is Perfect for adding additional safety and comfort. ( NOTE: Your equipment must have D rings for kayak seat) ??4 Adjustable front and rear straps to secure the kayak seat and provide a variety of comfort options