The Dakine Surface Vest is made with neoprene providing the ultimate in high-impact protection. It is compatible with both seat and waist harnesses and features a super-stretch design for movement freedom, a zippered front for easy removal, also a dual sport and closed-cell design. Please put in the order comments which color you prefer or it will be shipped on availability. Neoprene Features" 1 1/4"" [ 3cm ] Closed cell foam Waist and seat harness compatible Super stretch design for freedom of movement Zippered front for easy on/off Dual sport design Not USCG approved CHEST SIZE CHART Size Chest Size XS 33 - 35" [84 - 89 cm] S 35 - 37" [89 - 94 cm] M 37 - 39" [94 - 99 cm] L 39 - 41" [99 - 104 cm] XL 41 - 43" [104 - 109 cm] XXL 43 - 45" [109 - 114 cm]