For a boot in the mountians, I like to look at the weight as an important element. I bought some Wolverine (not really a top notch name) " whitetail" series and I loved them out west. I bought them in June and wore them alot and at 2.4# I hardly knew I had them on. Only 200 grams of Thinsulate, but again, for mountain walking, it was probably even a bit too much.