AARON S From another site: Waterproof leather and ballistic nylon upper for durability and comfort. Traditional lacing system for secure fit and comfort. Seam Sealed Waterproof Construction will keep all moisture out. Padded collar and gusset tongue. Features SNOWGRIP? rubber outsole that provides great grip and traction for a variety of surfaces. Shaft: 7 1?2 in Circumference: 15 1?4 in Weight: 1 lb 14 oz Product measurements were taken using size 11. Please note that measurements may vary by size. My experience: The tags say they are rated to -40f, and I found the cushioning exceptional. These are some of the most comfortable boots I have ever tried on. I don't know how they perform in really cold weather as it hasn't gotten really cold yet. I can tell you in the few minutes I wore them around the house my feet got much warmer than any other boot I have. I feel confident about wearing them when it gets cold out.