I bought a pair of these, sight unseen, for a trip to the UK. I literally received them, unboxed them, and boarded my flight. With no break in, I was walking between 20 and 35 miles a day in all sorts of terrain (from urban settings to rocky hiking trails) with a 30 lb pack on my back. Two weeks later, not a single blister, and my feet are very comfy. Highly recommended. Just make sure you order a half a size larger than you normally wear.