With half the weight of Darn Tough's cushion socks, the Darn Tough Heady Stripe Micro Crew Light Cushion Socks are lightweight cushion socks that deliver lightweight performance with the perfect amount of cushioning along the base of your foot. True Seamless construction provides a smooth performance fit and assures there s no slipping, no bunching and no blisters, while 17.2 Micron Merino Wool delivers supreme comfort. Breathable and fast drying, the "all-weather" Heady Stripe Micro Crew sock stays cool in the summer and warm in the winter plus it's naturally antimicrobial so it repels bacteria and odor a great feature when you need to get any extra day (or two) out of your socks.Features: Made in VermontGuaranteed for lifeMachine washableFabric: 45% Merino Wool/48% Nylon/7% Lycra Spandex Men's Sizing by Shoe Size: M: 8 thru 9 1/2 L: 10 thru 12 XL: 12 1