Compression improves blood flow.  The ribbed design ensures socks stay in place during strenuous sport activities.  15-20 mmHg

48% Alpaca
40% Acrylic
10% Nylon
2% Spandex

Small Fits Women's 5-8   Men's 4-7
Medium Fits Women's 8-10   Men's 7-9
Large Fits Women's 10-12   Men's 9-11
Extra Large Fits Women's 12-13   Men's 11-14