Aosom Padded Kayak Seat and Backrest - Black Made of a high quality water-resistant Neoprene fabric shell with EVA core for full bottom and back support 4 fully adjustable tie-down straps with snap-hook ends to better accommodate your specific kayak 1/2 inch thick cushioned seat and semi-rigid backrest offers a more comfortable kayaking experience Attaches and detaches easily for quick and convenient use Overall dimensions: 29.9"L x 20.9"W x 1.2"T