A turtleneck should be in every runner's cold weather rotation. It's a winter classic because of the way it adds neck protection from stiff winds and provides extra comfort when donning tall jacket collars. However, the high pile fleece and heavy cotton styles that usually adorn the ski slopes were never meant for running. Tracksmith's Fells Turtleneck refreshes the style with a soft, lightweight Merino wool honeycomb that resists odors and wicks sweat. Thumbholes add versatility on colder days.