3mm Anatomical cut and shaped legs allow easy entry and exit; 4mm uninterrupted chest to thigh paneling for optimal body positioning; High stretch large underarm gussets; Large forearm catch panel for higher stroke efficiency; Low line collar with smoothskin inside maximizes comfort; High stretch, low density neoprene with smooth, water-repellent nylon jersey lining; Invisible zip for streamlined speed, keeps water out; 16' easy to reach zipper pull cord.