The Women's Run and Bike Merino No-Show Light Cushion socks from Darn Tough are ideal for serious runners and bikers. Made of 100% fine gauge Merino wool designed for a breathable, itch free fit, the 1720 hugs your foot with no bulk and no seams to get in the way of your run or ride, and just the right amount of cushion. And the 1720 sock wicks moisture, dries fast and naturally repels bacteria and odor, which is also ideal for serious runners and bikers. Wink wink. These socks are tough, and the company backs up its word with an unconditional lifetime guarantee.