For years Sorel has been know as the brand to trust when it comes to warm, winter footwear. I just checked The Sorel Northern Lite Tall Boot for a customer and it is no different. The boot keeps feet warm with 200 grams of Thinsulate lining. It is fully seam sealed and waterproof. A lot of women want to know how high up on the leg these boots stand so I measured the height from the back of the heel to the top of the fur and it was just over 9 inches on all sizes. Sorel puts a temperature rating on all their boots and the Northern Lite is rated at -25 degrees Fahrenheit (-32 degrees Celsius). Sorel does put out a disclaimer that this rating is based on an average person's comfort level while being "active." Who spends much time outside when it is -25 anyways? Regardless I think most ladies will find this boot to be very warm and very fashionable anywhere from Sundance to Vail.