These socks wont stop global warming, but you might not mind quite as much. Coolmax Polyester yarns are engineered to move moisture away from your skin, to be fast drying and to enhance comfort. Legendary Darn Tough construction and performance fit assure that socks stay put and in place all day. No slipping. No bunching. No blisters. No hot spots. Cushioning on the foot base provides comfort and fit with the perfect bounce that hikers and trail runners love. Stay cool, keep hiking. Still made in Vermont. Guaranteed for life.