The NRS HydroSkin vest is great under a paddling jacket or worn alone on those sunny days when the H2O is cool. An ideal layer that keeps your core warm without the bulk. The 0.5-mm Terraprene core of the material provides insulation. The 4-way stretch PowerSpan outer fabric layer moves with your body for unrestricted mobility and comfort. ThermalPlush inner lining repels moisture and dries quickly. The titanium laminate adhesive reflects back your body's heat, increasing warmth without adding bulk. DWR coating forces H2O to "bead" and roll off the material, reducing evaporative cooling.