NRS HydroSkin 0.5 LS Shirt - Women's neoprene 0.5 mm Terraprene neoprene with heat-reflecting titanium cuts the chill on cool days Four-way-stretch Powerspan exterior allows unrestricted movement, andthe soft ThermalPlush lining feels great against your skin Paddler-specific design allows unrestricted freedom of movement and putsseams where they won't cause irritation Spandex fabric under the arms creates friction-free zones forcomfortable paddling while improving ventilation where you need it most A durable water repellent (DWR) exterior coating sheds water to helpreduce evaporative cooling