Design: COLD.RDY insulating technology keeps the feet warm in cold conditions GORE-TEX® Performance Comfort membrane for breathable waterproof protection Seamless overlays provide abrasion resistance and protection External heel clip provides heel support for lateral stability In-Shoe Comfort: PrimaLoft® Parley insulation adds warmth even in wet conditions Boost™ offers long lasting cushioning, energy return and high adaptability on rocky surfaces EVA stabilization frame adds lateral stability and mid-foot support Durability & Traction: Continental™ WinterGrip™ Rubber outsole provides superior grip and smooth transition in winter conditions Additional Details: PrimaLoft® Parley insulation is made with Parley ocean plastic Best for: Hiking, trekking