Testing out the Salomon Toundra Pro CSWP. I'll do about 20 to 30 miles on the treadmill as a pretest for fit. Then take them out on a winter backpacking trip. This boot incorporates Aerogel technology called Aerotherm, they are rated to keep your feet warm to 40°F. A very lightweight and flexible boot. Also, they are waterproof! I will post a followup. New improved toe cap stitching?