These socks rock. I will never spend ridiculous amounts of money again for technical socks full of materials I can't even pronounce. Wool is the way to go! I own a few pairs of SmartWool socks for warmth & comfort so I didn't know about if they could make a light micro sock, but I trusted all the reviews and I am BEYOND pleased with my purchase. You will not be disappointed. Last week I hiked Pikes Peak in Colorado from the Crags (12 miles round trip) and I only had to put ONE piece of moleskin on my foot due to an old blister from previous training when I was breaking in my new hiking boots. This is UNHEARD of while hiking a fourteener. I had ZERO new blisters at the end of 6 hours of intense hiking. These socks ROCK. I hiked Mt Evans, CO last year wearing mediocre hiking socks & I finished with blisters & feet full of moleskin, talk about uncomfortable. I am a believer & I will be purchasing many more of these perfect socks for everyday walking, biking & training. Side note - the socks will only work if your hiking boots have been properly broken in.