NRS Women's HydroSkin 0.5 Long Sleeve Shirt - The NRS Women's HydroSkin 0.5 Long Sleeve Shirt, the ultimate lightweight immersible base layer. The Four-way-stretch PowerSpan exterior allows range of motion and ThermalPlush lining delivers extra comfort. Wear alone or layer the HydroSkin for added insulation for warmth and comfort all day long.