I have a long narrow foot 10 4A and I am able to wear these for activities such as hiking and running without getting the usual blisters. I also wear them to work with business casual attire and on the weekends with jeans.
I have washed them in hot and warm water and thrown them in the dryer without any ill effects. The socks have not pilled with use.

I bought size Large and it fits perfectly.

My sock drawer is full of smartwool socks. Based on the performance of these socks, my sock drawer will be refilled with darn tough socks! The smartwool socks tend to pill and wear out in the heels rather quickly. These socks seem like they will last much longer.