INSULATION: 3-layer Merino wool blend insulation with moisture wicking air mesh and perforated air trap foam. Castle ColdShield® Tenchnology – 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 FEATURES: The Boa® System adjusts fit with precision and allows for quick release Boa® laces are lightweight, strong and expertly configured for comfort and performance Boa® low-friction guides ensure a smooth closure, every time Reflective elements Molded high abrasion toe Durable high traction rubber sole EVA footbed offers all day comfort and thermal enhancement from the cold.