I purchased these socks to wear mostly on casual Friday to the office, or on weekends when working in the yard.  After about 3 wears, I noticed that the heel area of this sock is starting to pill up a good bit.  It's not uncomfortable and it doesn't seem to be wearing thin anywhere yet, but I am concerned that these may not last all that long since the fabric is starting to pill.  My feet tend to get hot and sweaty if I'm walking a lot and these socks, and don't seem to stay as cool as they do in other brands.  These socks may be better suited for outdoor wear in boots and in cooler climates than we have here in the Mid-Atlantic coast.