I love these socks. The technology that Smartwool has perfected really is amazing. They are great for hot or cold weather, and they provide extra cushion on the trail. The added thickness helps my shoes feel a little tighter, with less sliding. The cost seems a bit steep at first, but when you realize the difference they make in comfort, you'll have no problem paying. I noticed much less fatigue on my foot the first time I used them, and blisters have been much less frequent.