PYROFLEX 1.5mm short sleeve rash guards provide thermal protection with a revolutionary design and high-tech materials ideal for tropical diving, snorkeling or pool training. Made with water-repellant, high-stretch Everflex X-Foam neoprene on the outside and a combination of fleece and plush on the inside, these tops offer warmth, comfort and range of motion, plus they dry quickly. PYROFLEX rash guards help keep divers and snorkelers warm when spending long periods of time in the water, and they are also great for layering.