Bursting with energy. Darn Tough's Burst Crew sock hammers from 9 to 5 and is still up for a hike at the end of the day. As always it delivers legendary Darn Toughness and fashion to boot. Ultra-soft, fine gauge Merino Wool makes it a year round, all weather favorite. True Seamless construction gives this sock a smooth, almost invisible feel from start to finish. Pure Bliss. Still made in Vermont. Guaranteed for life.