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-Layer Merino Wool blend insulation with moisture wicking air mesh & perforated air trap foam. Castle ColdShield® Technology: Removable insole engineered from a moisture wicking 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.