Columbia Women's Minx Mid Flash Snow Boot 100% Synthetic Rubber sole Shaft measures approximately 10" from arch Heel measures approximately 0.75" 200g Omni-Heat thermal insulation provides the highest heat retention of any synthetic insulation in the industry Omni-Heat thermal reflective system reflects and retains your body heat for an average of 20% more warmth Abrasion-resistant synthetic rand for durability Lace-up closure with gusseted tongue TechLite midsole provides shock absorption, support, stability and protection, and resists compression set