I got the Mammut comfort high GTX boot in a size 8.5. It's true to size. I wore them on my bicycle commute a couple of times. They were comfy, easy to walk in, not stiff, and had excellent breathability. I decided to wear them hiking, even though I didn't break them like one should. I took them on a 4.5 mile hike 'Malans peak,' the trail was steep and there was packed snow on the last mile of the hike. The shoes have excellent tread and I didn't slip on the snowy section, I didn't need cramp ons to my surprise and my feet stayed warm. Going down the steep terrain wasn't bad, I jogged a little and I could feel the ankle support. It was great. The width of the shoe is perfect. I usually buy wide width shoes and have been hiking with sandals for many years because boots are uncomfortable. There wasn't any rubbing and I didn't end up with blisters, hallelujah! Great boot, looking forward to a great hiking season, worth the cost.