From the manufacturer: The Jack is a bungee sealed whitewater skirt based on the fit and construction of the high-end Ace, the Jack employs a super stretchy neoprene deck and a bungee seal that fits easily and comfortably on a variety of cockpit sizes. A flange with urethane glue on the underside increases the seal against your boat. The Jack is a perfect skirt for all levels of paddlers.
Superstretch 2mm neoprene tunnel
Nylon pull loop
Bungee cord rand
Internal silicone grip printing
4 mm diamond-grid neoprene deck