The Fits Performance Trail Quarter Socks look different for a reason. The high cuff is a built-in scree-guard that helps keep out the trail while you're trail running. Below the cuff is a vented lower that increases breathability during highly aerobic activities. Similar to the Light Performance trail but designed in a medium weight for colder weather.Features: Fits patented Full Contact Fit hugs the contours of your foot and stays put so there is no loose socks to rub you the wrong way Hybrid performance cuff sits between a quarter and a crew height for added protection Extra cushioning in the heel, toe and the arch Quarter height is just above your boot line Increased durability in high abrasion areas Made in the USA Machine washable Fabric: 58% Merino Wool, 32% Nylon, 7% Polyester, 3% Lycra