Filson keeps you warm with a classic in the 1970s Logger Thermal Sock. Heavyweight boot socks with high wool content for insulating warmth. Crew length sits at the calves. Rib-knit shaft with color-block detailing. Elastic ribbing in cuff for a stretch fit that stays in place. Y-stitch heel. Smooth, flat toe seam. High-cushioning footbed provides added comfort. 80 percent Wool, 10 percent Stretch Nylon, 9 percent Acrylic, 1 percent Spandex. Machine wash warm, tumble dry. Made in the USA with imported material.