If there's one thing that unites women around the world, it's a desire for a permanent good hair day--just ask Sarah Potempa. After working with Hollywood's who's who, the celeb hairstylist launched her namesake brand in 2010 with a singular vision: making red carpet-worthy 'dos accessible to even the newbiest of styling newbies. For a limited time, get a free Dress Up Your ‘Do Kit with any qualifying full-size purchase of $25 from the Birchbox Shop. Use code: SUMMERHAIRGIFT at checkout.

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