Everyone should change their socks at least once a day as well as after exercising. However, if you are prone to sweaty feet—even when you’re not working out, or it’s not hot outside—you’re going to want to change them more often, maybe two to three times a day.  “Have spare pairs of socks on hand so that it is possible to refresh your feet instantly,” says Seelal. “You want to change your socks minimally twice a day or as often as you notice them becoming moist.”