These boots are suitable for 6000-7000 meter peaks, including Denali. They were purchased for climbs of Ranier and Denali, where they were used a total of 31 days and performed perfectly. They are warm and comfy... and are clean and still in excellent, like new, condition. There are no rips, tears, or blemishes. They have been properly stored to maintain the best condition possible. I wear size 12 in most shoes and boots, although my foot measures 12.5. I have Morton's Toe and it is accommodated by choosing shoes with wider toe boxes, but still normal D width sizing. I wore these boots with one thin pair of liners and one thick pair of mountaineering socks. They fit and perfomed amazingly. I had no trouble with the uphills or downhill. BTW: I wear size 11/44.5 in LaSportiva rock climbing shoes and they are "very" snug... the way they are supposed to be.
Keywords: High Altitude, Mountaineering, Boots, Climb, Denali,