The Overton's Women's BioLite Life Vest with Flex-Fit V-Back has a lightweight BioLite shell that allows water to dry quickly. Designed for increased mobility, the Flex-Fit V-Back design delivers a comfortable fit that moves with you. The vest has heavy-duty slide-release buckles and front zipper. USCG approved type III. Women's Chest Sizes: XS(28"-32"), S(32"-36"), M(36"-40"), L(40"-44").Vest Lengths: XS(19-1/2"), S(19-1/2"), M(21"), L(21-1/2").BioLite â An Eco-Friendly Alternative to NeopreneBioLite looks and feels like neoprene, but with many added benefits:• Lighter weight than neoprene. Contains no rubber foam.• Breathable material efficiently evacuates water and lets air through.• More environmentally friendly to produce. No lamination process. No Volatile Organic Compounds (VOCs) which reduce indoor air quality. Flex-fit V-back increases mobility Heavy-duty buckles and zipper closure USCG approved type III | Women's BioLite Life Jacket with Flex-Fit V-Back