Mucklucks Government calls them Boot Extreme Cold Weather N-1B. Boots have a high canvas top aprox. 18 in. tall with heavy-duty zipper 11 in. long. Bottom of boot is black rubber with laces like a regular boot, draw string at top of boot to keep out snow. Sturdy traction sole. These boots complete with a white wool removable liner like you see in ShoePacks or Sorrels.