While the merino wool is very comfortable and the waistband is nice, the inseam length is too short. I'm 5'9 and of modest build and the hem at the bottom of the leg as situated at the worst point on the thigh as their hem is kinda of thick. This creates pressure against the inside of the thigh and was uncomfortable. If they lengthened the inseam, by even an inch these would be a superb pair of underwear. Unfortunately, at this time I would consider them good for casual use, but not for days of long hikes.
I have been using the Ex-Oficio synthetic underwear for years for my workouts and on the trail but these are superior in every way! They are super comfortable, weigh nothing, look good, don't smell, keep you cool and don't have the bulk of other synthetics. I am transitioning to these as my others wear out.