SmartWool was the first company to make socks with Merino wool — an incredibly soft, natural fiber grown by Merino sheep that offers several comfort-enhancing benefits. Most importantly, it keeps your body temperature regulated regardless of the weather conditions — when it’s cold the fibers trap air to insulate your feet, and when it’s warm they breathe and wick sweat away from your skin to keep you cool and dry. SmartWool adheres to strict ethical standards to ensure all sheep used in the production process are humanely treated, with access to plenty of land, clean water, proper nutrition and medical care.