Kids' over the calf socks average 13 in. from heel to cuff - expect them to cover the leg to just below the knee. A performance fit means no slipping, no bunching, no boundaries. Here's to feeling connected and comfortable in your boots run after run. Unconditionally Guaranteed for Life - if these aren't the longest lasting socks you've ever owned, return them for another pair. Flex windows remove material in strategic areas to create a sock that's less bulky and really moves with you. Darn Tough's silky, ultra-lightweight socks are smooth, breathable, and feel like a second skin between your feet and boots. They close every toe on the socks using the True Seamless technology for an ultra smooth feel that's kid-approved. Made in the USA with yarns from America and around the globe - Every pair of socks is knit in Vermont - the perfect testing ground for the finest premium all weather performance socks. Merino Wool has a natural ability to move heat and moisture, keeping skier's and rider's feet warm and dry.