Castle X Men's Charge Atop Snowmobile Boot w/Castle ColdShield

INSULATION: 3-Layer Merino Wool blend insulation with air mesh & perforated air trap foam. Castle ColdShield® Technology: Removable insole engineered from a wool blend with a metallic heat reflecting layer. WATERPROOFING: Fully integrated Castle DRY-X® waterproof membrane. Weatherproof treated shell materials include 1000D nylon upper with Armstrong PU coated leather.