HydroSkin socks are the ultimate wetshoe liner, providing an extra layer of warmth while helping to protect your feet from blisters. Plush lining and superior stretch of HydroSkin offer unbeatable comfort. The second generation of NRS HydroSkin® has arrived. It's more durable with greater snag resistance, more comfortable with stretchier layers, and dries more quickly than the original. - New ThermalPlush fleece inner layer for comfort and low water absorption. - TiCoat membrane contains millions of titanium particles, to reflect your body heat back to you. - 0.5-mm neoprene insulates and protects. - Improved 4-way-stretch PowerSpan outer layer provides extreme mobility and rugged durability. - Odor-fighting antimicrobial treatment.