I love these socks for just lounging around the house and they're very comfortable, but I think the bottoms are too thick for running. They have padding on the bottom under the heel and forefoot. This eliminates some of the sensation you get in these areas, which makes you more prone to heel-striking. They do a pretty good job of wicking away sweat compared to other socks and for that reason, I give them 4 stars because they're good for longer runs, but I wish the entire sock was a uniform thickness.