In terms of insulation, not all insulators are created equal. Boots like the Lowa Sheephunter and Schnee's Granite are using PrimaLoft insulation (200 Grams). IMO PrimaLoft is about as good as it gets for warmth: it has a higher warmth to weight ration than thinsulate or other synthetics (200 gms of PL would be about equal to 400gms of thinsulate), and it much more effective at moving moisture and maintains its insulating ability when wet (thinsulate loses r-value with saturation)!
It's good to hear first-hand experience with the Primaloft... I'd heard the same thing about 200 Primaloft vs. 400 Thinsulate, but my only experience is with 400 and 600 Thinsulate. The Granites I have will be my first venture with Primaloft on the mountain.
Hopefully I can smack a bull early on and avoid -20 hunting!
