Kamik Men's Icebreaker Work Boot Synthetic Made in USA or Imported Synthetic sole Shaft measures approximately 13" from arch Heel measures approximately 1.5" Platform measures approximately 0.5 inches Boot opening measures approximately 17.5" around Temperature rated to -40f Removable 8mm thermal guard liner. Zylex removable liner 97 percent recycled content. Moisture wicking lining Waterproof adjustable collar Oil and acid resistant Self cleaning lug outsole Made in Canada