Tip - How to Keep Wigs From Slipping | eHow

"Don't flip your wig!" This '60s saying is meant to be flippant -- but it's no laughing matter if you wear a wig -- you don't want it to slip. A wig cap can help keep it in place and prevent it from shifting. It also helps keep your wig clean, because it serves as a barrier between your head and the wig.