The O'Neill Competition Vest lineup defies convention and sets a new industry standard for performance-driven technology. The lightest vests in the water just got lighter, stronger and dry faster than ever. Nytrolite Foam Technology. Low-Density Polyethylene which is expanded using Nitrogen in an exclusive process which cannot be duplicated. 3x lighter than PVC foam. Closed cell foam structure that absorbs 15-20% less water. Approximately 10% more buoyant than PVC meaning we can use less foam in each vest and it will still float the same. WARNING - THESE VESTS ARE FOR COMPETITION WATERSKIING AND WAKEBOARDING. THEY ARE NOT APPROVED BY THE U.S. COAST GUARD. THESE ARE WAKE AND WATERSKI WETSUIT GARMENTS NOTE: These Vests Fit 1 Size Small Life Vest Features 100% UltraFlex DS Front Zip Reversible #10 YKK Zipper with Safety Tab Nytrolite Foam Segmented Foam Core Anatomical Flex Points Strategic Armhole Fit