The Evos are my go-to winter boot for the Whites. Have done all 48 in winter using them with zero problems (neither blisters from sweat nor cold toes). I've worn them to the summit of Washington in winter 6 different times, and have done two presi-traverses in winter, all in comfort. In one Washington summit climb the Mt. Washington Observatory was clocking a temp of minus 5, with 80mph winds and 110mph gusts (-50 degrees with windchill). The boots were fine.