Never knew a pair of socks could feel so good! Bought them for my son, but they are now mine. While not an expert opinion, I have arthritis in my feet and when these socks are on my feet,they feel so much better! I can wear them all day and my feet are not sweaty when I take them off. I'm not sure why they help with the discomfort in my feet, but they do. The black socks are thicker than the white ones, so they are my favorite.