Men's soccer socks are the largest size soccer sock you can purchase. These socks come in a sock size XL which can fit shoes sizes up to a men's shoe size 13, 14, 15, or 16.
The material of a soccer sock is a mix of various blends of synthetic fibers to make a sock that is soft and durable. Key necessities of a soccer sock are that it stays up, holds your shinguard in place, does not loose its shape, has cushion, is soft and reduces blistering. Cotton soccer socks are hard to find so we would suggest using the TruSox crew sock with your long soccer sock since the TruSox product is mostly cotton in the foot. Nylon, polyester, and polypropylene are commonly used in socks to create a nice durable soft sock with spandex or elastic added in for compression to hold your sock in place.