M's 10-12

W's 12-14

The Vertex 1/4 Crew Ultra Light socks from Darn Tough are ideal for serious runners. The 1768s are incredibly light but still incredibly tough. The True Seamless construction reduces hotspots and blisters and the ultra high stitch count creates a super comfortable sock with a streamlined fit - no slipping, no bunching, no blisters. Fine gauge Merino Wool makes this a fast drying and breathable "all-weather" sock that stays cool in the summer and warm in the winter and since Merino Wool is naturally antimicrobial, this sock repels bacteria and odor when you're laying down the miles. These socks are tough, and the company backs up its word with an unconditional lifetime guarantee.