These boots are warm, light and have great ankle flexibility. They are a bit narrow for my med-wide foot but I deal by having my local cobbler throw them on the stretcher overnight. They climb steep ice and mixed terrain exceptionally well. The rubber sole grips rock like nobodies business. They have held up for two seasons of heavy use and will be getting used again soon!

These things rock my world. I was climbing with the Nepal Tops and have seen the light! There is a hop in my step and an extra swing in my tool- cause these things do not weigh a thing. I was a bit worried about the lack of support compared to the Nepal Top, but find that it is not a problem- I would easily trade the flexibility and versatility of this boot over the heavier ones. That said, I found myself back in plastic boots while ice climbing this weekend in minus 25 degree weather. Burrrr!

I've climbed in La Sportiva K4S, Koflach Verticals, Degrees, Invernos, and Scarpa Alpha's. This boot excels in warm weather technical exploits. It handled the long approach to Gannet Peak fairly well. On the mountain the boot is light, nimble and warm. If the temperatures dipped below 20 degrees I wouldn't want to spend much time standing around in it... that's not really what the boot is designed for. If you want cold temperature performance, this is not your boot. If you have a narrow foot and want a precise crampon compatible boot, this boot will serve you well. If you have a wider foot consider the Aku Spyder.

Just summited Rainier in these bad boys. No complaints. My brothers older Makalu's ate his feet for supper (the old bloody sock), but these (still brand new with almost no break in) felt great. My feet on the other hand are hurting (got a good case of X-Mas toe), but I doubt it's the boots fault. More like the 12+ miles with an 85Lb. (from Paradise to Muir and back)/40Lb. (from Muir to the summit and back) pack.

This is my first pair of mountaineering boots. I wear a size 9.5 - 10 US and my foot is pretty narrow. I bought a size 43/US 10. So far I've done some ice climbing in them and hiked several miles to do some mountains and steep couloirs. Not only are these boots very light, but there are EXTREMELY comfortable. I think they are more comfy to hike in then my Vasque hiking boots. Haven't tried these in really cold temps yet, but waterproofness/breathability is excellent. Am really happy with these boots!

My quest for light boots with a toe bail finally ended. The construction is solid and the fit is very good. You might want to consider getting a size slightly smaller than your winter boots because you probably wont be wearing the same socks. Nevertheless, I bought the same size and am happy.