The Grasmere riding boots by Ariat are built to take on the most extreme cold conditions. They include Primaloft® insulation to keep feet warm and waterproof GORE-TEX® bootie construction to keep feet warm and dry. These boots stay secure and stable thanks to performance-maximizing ATS™ technology. The innovative Advanced Torque Stability (ATS®) Technology supports and cushions the foot as you move, promoting good posture. Ariat's exclusive Duratread™ rubber compound combines maximum wear-resistance with comfort and flexibility. It outlasts traditional rubber and is extremely flexible for ergonomic performance. This outsole is highly resistant to barnyard acids, oils, and slips, safeguarding from the ground up.