Basics like socks, underwear, and T-shirts are the sorts of things that end up as stocking stuffers or small gifts, but they're also the type of thing you wouldn't usually spend top dollar on. Consider this the time to rack up on higher-end items like synthetic, moisture-wicking base layers, bamboo cotton boxers, and socks made from fabrics like merino or cashmere. Normally, you wouldn't give a second thought to this sort of stuff, but when it's practically free, it's the perfect time to see what works for you.