The most nice piece of neoprene you will ever wear. Cut and Built for Girl this HydroSkin shirt will keep you warm on cold H2O days, and makes a great base layer for cold weather. HydroSkin's 0.5-mm Terraprene helps hold in heat without restricting your movement. ThermalPlush inner lining increases insulation, repels moisture and dries quickly.4-way stretch PowerSpan outer layer allows easy, unrestricted mobility. Lycra underarms eliminate binding, adding to this top's superior function either as a single outer layer or as a base layer. Titanium laminate adhesive aids body heat retention. DWR coating forces H2O to "bead" and roll off the material.