It’s warm. Not too warm. Just-right warm. Knit on the same 200-needle machines as our Signature Wool Sock , the Winter Wool adds terry loop padding to the footbed and up over the toes for added comfort against the elements without adding bulk. Using premium ultra-fine Merino Wool blend for unmatched fit and feel. The higher needle count (think thread count in sheets) produces a dense sock that remains thin and conforms to the foot. The strategically placed padding keeps the socks comfortable in a cycling shoe without feeling constricted. Fine micron merino wool is a naturally warming and wicking fiber. Nylon is incorporated for durability and longevity in high wear areas, with a touch of Lycra® for a perfect fit.