This sock has terry loop construction along the sole of the foot to provide cushion, padding, and comfort where it's needed most. The ribbed knit along the top of the foot and up the calf allow for increased breathability and moisture wicking. Dense knit construction along with arch and ankle support bands keep the sock tightly in place throughout the day without bunching or slipping. 60% US Alpaca 35% Recycled Nylon 5% Lycra