This semi-drytop has it all, yet packs small. High-stretch neoprene on the outside, with a rubberized seal on the inside. Stretch panels across the back and elbows and under the arms. The innovative Hyperseal™ collar is soft, non-chafing Lycra and pops up to slip easily over your head. A UV-resistant, anti-fog window in the sleeve locks in place over your watch for hassle-free time checks. Stash pocket on the shoulder. Ventilation pockets on the chest. 3M reflective accents. Stay-in-place waistband and cuffs. DWR-treated polyester bonded with PU membrane and tricot.Sizing Charts