Protecting your extremities, the NRS HydroSkin sock keep the feeling in your toes when the water gets cold. Tap dancing anyone?. . . 0.5 mm Terraprene core, a non-petroleum based neoprene alternative. Adaptable to any season, Hydroskin can be worn alone or as part of a layering system. 4-way stretch PowerSpan outer layer allows for unrestricted mobility. ThermalPlush lining increases insulation, repels moisture, and dries quickly. Titanium laminate adhesive aids in body heat retention. DWR (durable water repellent) coating forces water to bead and roll off the material. Shoes sizes; XS - 3/4, S - 4/5, M - 6/7, L - 8/9m XL - 10/11, XXL- 12/13. 603403373032 20307000056 30011.02