The Competition Short Sleeve is Immersion Research's premier 3-season jacket. Now features ergonomic seaming for greater mobility and comfort. Made with 3 layer waterproof/breathable Entrant(r), lightweight waterproof/breathable inner tunnel, our unique all neoprene neck gaskets with a sticky rubber band, sticky rubber bicep gasket, zippered semi-dry pocket on front chest, adjustable neoprene waistband. Seam taped throughout.