The fiber
Everyday socks are often mostly cotton. Hiking socks are merino or synthetic blends with nylon for strength. The cotton guide explains why that matters on a wet or long day.
Padding where it counts
Hiking socks place cushion underfoot and often at the heel, ankle and Achilles, where boots press. Everyday socks have little or none.
Fit and height
Hiking socks are shaped to stay put, with a heel pocket and a smooth toe seam, and come in heights matched to shoes and boots.
Price and how long they last
Maker list prices here start around $12 for a liner and run to about $35 for a heavy sock. Several brands guarantee their hiking socks for life, which few everyday socks offer.