Tecnica Men's Wyoming Pull-On Winter Boot 100% Leather Rubber sole Shaft measures approximately 8.5" from arch Heel measures approximately 1.25" Boot opening measures approximately 10.5" around Oversized rolling zone provides progressive and uniform energy transfer eliminates dead spots Primaloft is the ultimate warm lightweight winter boot insulation PCS triple density footbed that is also featured in ski boots and delivers superior warmth and cushioning TeciGrip is a speciality formulated winter compound on the outsole that keeps you safe and sure-footed Lateral Catamaran is a low profile cradle integrated with outsole to provide maximum dynamic and lateral stability