Icebug Men's Metro Bugrip Studded Traction Winter Boot Synthetic Shaft measures approximately 5.5" from arch Upper: Split grain leather and Protec PU (polyurethane) Lining: Hydrophobic polyester short nap fleece Midsole: EVA with ESS stabilizer Outsole: Rubber with BUGrip 16 carbide tip studs Comfort zone: -20C