Comfort zone up to -55C  Retractable cleat system with anti-slip sole TPU shell 100% premium leather 100% extreme impermeable membrane 400 g Thinsulate Impermeable zipper with pleat Lining: 50% Merino wool / 50% Polyester Removable polyurethane laminated insole Removable aluminum/felt insole Real rubber outsole Stainless steel cleat