GIVEAWAY: Win Two Mondo Guerra for Piperlime amfAR Benefit Tees

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Enter for a chance to win both of these Mondo Guerra for Piperlime amfAR T-shirts by signing up for the free Racked National newsletter below!

Last November, when Project Runway's Mondo Guerra created his first Mondo for Piperlime charity T-shirts, they sold out in, like, three seconds—even Jessica Simpson got into the do-gooder spirit and scored one for herself.

Since the first tee was such a huge success, the folks over at Piperlime decided to collaborate with Guerra again to create two more limited-edition charity T-shirts—one men's, one women's—with $20 from the sale of each tee benefitting amfAR, the foundation for AIDS research. The new shirt went on sale this week at piperlime.com.

All you have to do to enter for a chance to win two T-shirts of your very own is subscribe to the free Racked National newsletter—enter your email address in the box below—before 6 p.m ET Friday, February 4th. We'll pick a winner at random at 6 p.m. Friday evening. If you're already subscribed to the Racked National newsletter, you're automatically entered in the contest. One entry per email address, please.