5/3mm Mens SPRINT Short John The SPRINT Short John includes the same cutting-edge materials and features as Neosport's SPORT John, but is cut above the knee for warm-water training and competition. Designed with Neosport's exclusive 5/3mm Speed Skin neoprene, it provides the same great buoyancy and stealth as Neosport's SPRINT John. 5mm Speed Skin neoprene on the chest allows for ideal positioning in the water with reduced surface resistance. 3mm neoprene on the back permits maximum range of motion.