I got these socks ahead of my first half marathon (now complete!) they are the best running purchase I’ve made. I suffer at times with calf cramp and shin splints, I wore these during my race, I ran for nearly 3hrs in 23 degrees and finished with no blisters, no calf cramps during or after and no shin splint. They didn’t ever start to slide down or bunch. I wore my spares the next day for recovery as well and had very little after run soreness. Really really pleased and have been recommending to my runner friends.