Looking for an ultra-light running sock that disappears when you put it on? Weighing in at a mere 13 grams per sock this is the lightest sock we make but still incredibly tough and comfortable. True Seamless construction reduces hotspots and blisters. Ultra high stitch count creates a super comfortable sock with a streamlined fit like no other. 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. Plus they even have that handy lil' tab on the back so they slip on easy. Still made in Vermont. Guaranteed for life.