Keep on running even when the weather takes a turn and conditions are against you with UpHillSport “Frost Trail” Running L3 Socks. These lightweight ankle high socks use fine, thermally effective merino wool in combination with a special ventilation structure for better moisture release, keeping feet as dry as possible from sweat. Merino wool brings breathability and the ability to keep feet warm even when wintry running conditions are wet. The Y-heel shape keeps the sock well in place and supports your performance, while the seamless toe design prevents chafing and blisters. All UphillSport socks incorporating merino wool come from mulesing free farming sources.