Flowt Type lll Extreme Sport Neoprene Life Vest 1.5 mm thick premium neoprene (inner and outer layer); Full body neoprene allows maximum comfort and protection 3 body belts with 1 1/2" adjustable belts and YKK buckle and zipper Chest sizes: S/M 32"-40", LG/XL 40"-48", 2x/3x 48"-56"