The zipper secures the jacket onto your torso for a snug fit while the dual quick-release buckles around the waist keep the jacket from riding up. This adult PFD is made from evoprene, a soft, fast-drying material designed to promote mobility while ensuring proper flotation in the water. This makes it great for water sports activities or just relaxing on the boat. The FEEL GOOD Life Vest offers maximum flexibility and safetyApproved by the U. S. Coast Guard and Transport CA