Summer is the ideal time to learn how to do the perfect messy bun. It’s a quick and cool hairstyle solution when the temperatures are sizzling. The casual, undone, messy updo hairstyle is also extremely versatile. It works for anything from a quick run to the grocery store to your cousin’s wedding. The messy bun masters at Matrix share their tips for how to do a messy bun, along with a few tried-and-true messy bun step-by-steps.