I've been thinking about buying some insulated hunting style boots for winter riding. I'm in Virginia, so I'm not talking frigid conditions, but something that will keep me comfortable for a day long ride in the upper 30/lower 40 degree temperatures. Looking around, everything seems to be rated in grams of insulation. One site says 3M gives these recommendations for selecting Thinsulate for footwear: 200 grams for cool conditions or high activity levels. 400 grams for cold conditions or moderate activity levels. 600 grams for very cold conditions. 800 grams for extremely cold conditions with light activity levels. 1,000+ grams for extremely cold conditions with light to minimal activity level. Has anyone had any experience with selecting these types of boots? I want to be warm, but I don't want something that is going to be hot either. In addition, the higher levels of insulation tend to mean thicker shoes, and I prefer to avoid that, as they can be somewhat clumsier with the controls. I was guessing perhaps the 600 gram boots, but it is just a guess.