Terramar Men's Ec-2 Thermasilk Pant has 100% silk interlock knit construction produces a heavier-weight fabric than the conventional filament jersey fabric. The heavier-weight fabric of the Terramar Men's Ec-2 Thermasilk Pant retains all the luxurious soft, moisture thermoregulation characteristics of EC2® Qwik-Dri™, while adding extra warmth for winter's coldest days providing superior comfort in a layering system. So on winter’s coldest days wear Terramar Men's Ec-2 Thermasilk Pants.