Stay safe and comfortable on the water with the Onyx Outdoor™ 24 Automatic/Manual Inflatable Polyester Life Jacket. This life jacket is made of 300-denier polyester to help prevent tears and punctures and features a soft, extended neoprene neckline for comfort. This life jacket automatically inflates when immersed in water or when you pull the Jerk to Inflate handle and can be converted from automatic/manual inflation to manual-only inflation.