Astral's V Eight lifevest is the world's first breathable PFD. Redesigned for 2015, The V Eight combines Astral's Airescape technology patent pending with an ergonomic design, and light weight construction making it ideal for warm weather. Super high mesh back makes for a great fit for the tallest seat backs. This vest also features two large, expanding mesh pockets, a quick access knife tab, and Velcro on shoulder straps to manage loose webbing ends. Designed for recreational kayak or canoe touring, sea kayaking especially in warm weather Features Airescape technology with vented ports on the front and back of the vest which allow trapped body heat to escape Contoured foam and soft mesh liner promote air flow Super high mesh back provides a great fit for tall kayak seat backs 2 Large and expanding mesh zippered pockets keep essentials handy Quick access knife tab on chest Front zip with side and shoulder adjustments 100% PE foam and EVA foam flotation Sizing: Chest in inches S M: 31 37 in. M L: 38 44 in. L XL: 45 51 in.