The best lesson I learned this past winter was having the right mittens is important. I started with an insulated mitten with a waterproof shell and a removable liner. The insulated shell part was too warm for 30 degree freezing rain but the liner wasn't waterproof. The result was that I sweated inside my mittens which Froze later. I now have (Thanks to Rocketsocks) a pair of Shell Mittens without Insulation and seperate liner mittens. The flexibility wasn't there the first time. It sucks putting clothing on to thaw the clothing.