The SCARPA Kailash is an outstanding boot for back country travels, especially with an actual load on your back. I wore the boots on a week long trip in the Pecos Wilderness with a 35-40 pound pack and was impressed each day with the light weight, comfort, and performance on a variety of trail conditions.  The boots proved their waterproof qualities, but breathability was excellent and my feet never felt steamy or overheated (temps were in the 50's to 80's).  Even the laces were soon a favorite. Tie a simple knot in the morning and the boots stay tied all day.  Sounds simple, but having experienced a rash of "Houdini" like laces of late I was impressed.  One trip doesn't provide much of a basis for judging durability, but the construction appears very solid and I experienced no warning signs of future problem areas. I did pick up one blister on my right foot. I was not surprised given my personal fit challenges for that foot; my left foot was comfortable from day one. When I removed the insole the problem went away and comfort was fine for the rest of the trip. There is no seam on the foot bed and I did not miss the stock insoles at all. If you do need an aggressive orthotic insole the vertical volume of the boot might be a concern you need to consider.  While not cheap, the Kailash boots are a great value for a high performing backcountry boot.