Jobe's 4 Buckle Vest is a 50N ISO certified life jacket and is made of the strongest nylon. Both the front and back of the 4 Buckle Vest are made of soft PVC foam panels on the front and EPE foam panels on the back to ensure comfort and extra protection. This vest comes with a D-ring to which you can attach the deadman's cord and a water drainage system so that water does not stay in the vest. The strong YKK buckles and adjustable straps ensure a perfect unisex fit with comfort and safety.