The Aqua Lung Snorkeling Vest is made from 200D nylon with excellent UV resistance. Fully adjustable nylon webbing waist and full length back/crotch straps with non-corrosive ABS plastic buckle fittings. Vest is ideal for rental & snorkeling tour operations and as a personnel vest for recreational snorkeling where safety is a primary concern. Sea level buoyancy in the small sizes is 10 lbs. (4.k), in medium 15 lbs. (6.8 kg) and 22 lbs. (10 kg) in large size. Vests have an easy to use chest mount oral inflator and come in bright yellow for great visibility on the water.