This is a thread about hard-wearing socks and the yarn to make them from--and why. The OP asked about hard-wearing socks, and I responded about yarn, which answers at least part of her question.
Maybe some of my response will help. Acrylic is not recommended for long-lasting socks for anyone who uses the socks for walking. Baby socks, yes; bed socks, yes; but socks that will be subject to the pressures of a foot on the ground/floor/in a shoe, no. At least, that's what Clara Parkes, my source for the information, says.