Cold feet? The struggle is real. For the never warm, our synthetic Due North ski/ride socks are built for two purposes: warmth and longevity. The hollow, moisture-wicking fibers from our 100% recycled THERMOLITE® ECOMADE materials trap heat and insulate feet with a soft, dry layer that protects you from hot spots, holey socks, and the need for frequent visits to the lodge to thaw out.