This is a waterproof snow boot rated for outdoor use in deep snow and extreme low temps!! Bought about ten years ago, so unfortunately I can’t remember the model name from Sorel or the exact temperature rating. But I do remember researching the different boots and wanting something more rugged for time spent outdoors around the Great Lakes in winter, so I chose these … somewhere between the Joan of Arctic and the Glacier. 14” tall 14” calf circumference