Behold! Urban Outfitters hair chalk is here! What is hair chalk you ask? Hair chalk is the easy, and semi-permanent way to execute the oh-so awesome multicolor hair trend. First seen on the runways of Proenza Schouler in Spring/Summer 2010, and then a year later on the models at Meadham Kirchoff Spring/Summer 2011, and most recently in editorials from Harper's Bazaar and British Vogue, there is no doubt that the colorful tresses trend is here to stay. If you want to try the multicolor hair thing, but don't want to commit to even a semi-permanent dye like Manic Panic, I suggest hair chalk. It is super easy to use, and the new UO pack comes with 32 colors, some bright, some dark. All you do is rub it on pieces of wet or dry hair, and voila! You've got a whole new look, even if its just for a day. - Maddie UO Hair Chalk Green ends at Proenza Schouler Spring/Summer 2010. Chloe Norgaard photographed by Terry Richardson for Harper's Bazaar. Malgosia Bela photographed by Tim Walker for British Vogue. Rainbow tresses at Meadham Kirchoff Spring/Summer 2011. A look created with UO's hair chalk.