The shapes of their feet are slightly different from each other, which is why many socks and shoes are categorized by gender. A woman’s feet tend to be more narrow and curved, while men’s feet tend to be wider with not as deep of an arch. While this is just generically speaking, the sock sizes are going to fit and feel different upon wearing them. The color selection and designs are usually different too.
Those meant to be worn by women tend to be more colorful and attractive in design while men’s usually feature more simple designs with neutral color options.