im climbing in kazaksthan for 3 years , i use sportiva glacier mtn boot up to 4200 metre peaks and find them a little cold in the toes.i also using size 42.5 i have a size 10.5 runner shoe,and i get black toenails all the time ,i have to buy a pair of 43.5 maybe 44 and looking at neapl evo gtx as the only real choice of boot for climbing ,anyone care to commernt please,thanks guys

the 43.5 works great and im a 10.5 also. they have been very comfy with little or no break in. 43.5 would probably be about right. and with the backcountry return policy you can always send the wrong pair back.

This would be a great choice. They are much warmer than the glaciers....these are made more specifically for cold weather mountaineering. I wear 44 in running shoes which is what I took in these as well and I haven't had any toenail issues. The toe-cap in these boots are almost like the nose of a rounded missile so rather than a harsh edge you've got a rounded surface which is much better to combat toe problems. These are a great choice though. I got 2 pair as I use them for everything from hiking to extreme mountaineering. They're comfortable enough for anything you throw their way!Hope that helps.