Just bought these for tree climbing. Have a pair of regular Glaciers that are a half size too small, but I still wear them all the time. Tough boots that wear great. Replacing a brand new pair of overpriced Whites that started to fall apart after one hour in the spurs. Heel started coming apart and the fit was sub par. So I bought the WLF because they are true to size, (for me) stiff enough for my spurs,( great arch support) will hopefully wear like my other La Sportivas and were two hundred bucks cheaper than the Whites. Also the WLF is slightly taller than the older Glacier witch is a plus for climbing. They are a little warm in the summer time but so comfy and supportive that its worth it to me. I have a slightly narrow foot in the arch and ankle area that seems to fit well in these boots. No problem with heel lift. They flex well at the ankle. Hard to notice any big differences in fit between the Glacier and the WLF, even with the half size difference. My Glaciers are some years old now (5 years ?) and only have a problem with the extra rand peeling in some spots, witch the WLF does not have so Im predicting great things from this boot. They are a little on the stiff side, but thats why I bought them. For hiking purposes these may take a while to fully break in for good flex during walking, so I might suggest shorter hikes before any epic thru hikes. I just cant think of any negative things to say about these boots. If I was a tire salesman I would market these as a run flat! They just wont blow out... and I am hard on boots. Quality Italian!! Super happy LaSportiva custy for life.True to size I use them for school every day, didn’t have to break them in.. I climb utility poles all day and from the first day they felt great!Nice bootsI purchased this boot because i was tired of blisters and needed a boot that i could lace up and hit the ground running. The boot held up good thru a 5 month fire season. The boot is insulated so be prepared for a warm foot. This was nice at nigh but a little annoying during a scorching day. But as most firefighters know and or will learn having a good boot is one of the most important things you could have and i received this from my pair of Sportivas. The laces had to be upgraded to kevlar because i burned/cut mine but other than that i had little problems. The boot took about 40 hours to break in, the break in phase was a little bothersome but for me it was due to the boots being laced to tight. The glue held up good, but i can see it becoming an issue down the road, i figure ill get one more season out of the boots and ill get another pair.I bought this to replace my old Garmont hiking/light mountaineering boots. Since I also do a little firefighting I figured awesome, a do all boot. I don't do big frontline stuff, mostly grass and sage so this should be perfect. I was first off blown away at the padding in the tongue and ankle. Way more than any heavy hiker I've used before. Compatible with toe box crampons to boot. The fit was perfect and the lacing system rocks. Easiest heavy boot to get in and out of. Looking forward to some peak ascents and so fires this summer.I am definitely happy with these boots so far. I have only had a chance to wear them a few times, but one of those times was on an 8 Mile day hike. I was pleased with the level of comfort and support. The stiffness takes a little getting used to, but was really happy to make it back with no blisters or hot spots. I did have to adjust the tongues once or twice until I got them just right so they weren't pinching my toes.So far so good. As others have stated. There is a break in period. I have not done any serious hiking in them yet. But I have worn them all day walking around job site and driving around. I really like them so far. I’ll rate them again after a fire assignment or serious hike!Make sure you break these in before hand. I had sores for a week because I didn’t break them in enough. They fit as expected