Challenger K2 Kayak 2 person kayak is made of rugged SUPER-TOUGH vinyl made stronger for durability. High visibility graphics allow others to see you easily. The cockpit is designed for comfort and space and has an inflatable seat and backrest. US Coat Guard ID. The Intex Challenger K2 kayak offers two people a sleek easy-paddling and highly portable craft to explore lakes and easy rivers. Its made of the company's rugged Super-Tough vinyl that's puncture- and UV damage-resistant for long term durability and the cockpit is designed to optimize comfort and space. High visibility graphics allow others to see you easily on the water and the craft is US Coast Guard approved. strong-featured/stronger //p ul Li Two-person inflatable water craft for lakes and mil