I have been wearing SmartWool trekking socks for years and swear by them.  When I saw the knee socks in a store I had my doubts they could compare, but found they are also amazing! I've been buying them up like crazy in black and brown to wear as trouser socks for work and under my knee high boots.  Like another reviewer said, I have couple pair of work shoes that are a little too big for the standard thin trouser sock and these help the shoes fit perfectly.  They don't itch or chafe, and they seem to come out fine in the washer and dryer.  I've been wearing a pair almost every day to work for months and haven't noticed any wear, but like I said, I have a bunch of them.  They are snug at the top, but I have thinner legs so this hasn't been a problem for me.  I can't say enough good things about them.