The Carolina Ultimate Merino Wool Blend Boot Sock (2 Pack) - Youth is a medium-weight sock for in-boot comfort. Kids deserve the best and the acrylic, merino wool, nylon, and spandex blend delivers next-to-skin coziness during every hike. The tall height provides cushion from mid-calf to toe inside a range of boot heights. They wick moisture, dry fast, and remain durable as they learn the ins and outs of camping, hiking, and backpacking. Please note the socks are offered here in youth footwear size range 11C - 5Y, which in foot measurement is a range of approximately 6.75" to 9" heel to toe.