NRS HydroSkin 1.0 LS Shirt - Men's neoprene 1.0 mm Terraprene neoprene with heat-reflecting titanium protects you from chilly water and weather Four-way-stretch material lets you move freely, while the soft ThermalPlush lining adds warmth, dries quickly and feels great against your skin Paddler-specific design puts seams where they won't cause irritation The chest, back, shoulders and upper arms feature water-shedding smooth-skin neoprene to help prevent evaporative cooling Thinner HydroSkin 0.5 panels under the arms reduce bunching for greater paddling comfort