With a thin profile for maximum comfort, the Coaster PFD also reduces interference with your boats seat. . . . . . . . Thin back design works with all types of seats. Durable mini ripstop nylon shell, 200D oxford lining, and lightweight PE foam. Mesh shoulder, interior panels, and open sides for fantastic ventilation. Cross chest cinch harness helps stop PFD from riding up. Adjustable shoulder and dual forward pulls allow you to dial in fit. Zippered front pockets for securely keeping essential items close. US Coast Guard approved. Type III PFD.