Baffin Men's Snosport Hiking Boot 100% Manmade Imported Rubber sole Boot opening measures approximately 15" around Molded tendon guard and raised ankle ledge for snow shoe straps and equipment Waterproof, breathable membrane Baffin B-Tek hollow fiber insulation rated to -4 degrees Fahrenheit Removable multi-density insole Single-pull lace system with lace-lock Tackle the toughest, most winter-blitzed terrain in this high-functioning, aggressive boot from Baffin.