You can't wear normal socks with Vibram Fivefingers. You need toe socks like the Injinji Performance. In addition to keeping your toes from rubbing against each other, they also keep your feet cool, dry and comfortable whether you're running, hiking, running, or doing any kind of sports activity. Injinji socks have compression bands across the forefoot area so they don't slide off inside your shoe. They feel great with any pair of shoes, not just the Fivefingers. In fact, they're even better on normal shoes. You can even wear them with flip-flops all year round.