You know the old adage “do good, feel good”? Well, we firmly stand behind that, though we have to admit getting a little perk for doing good never hurts. As luck would have it, Old Navy and TerraCycle Canada have just teamed up to offer theFlip-Flop Brigade, an initiative that allows consumers to send in their old flip-flops to TerraCycle and receive an exclusive coupon to Old Navy in return. Not only does that mean you have some extra cash to burn in-store, but you’ll be saving your old sandals from wasting away in a landfill. Instead, the worn down flip-flops will get a new life as they are recycled into everything from playgrounds to bike racks. This isn’t the first time Old Navy and TerraCycle have teamed up: they started a one-month flip-flop collection run last spring starting on Earth Day, and managed to recycle almost 20,000 flip-flops. If you’ve been holding onto beat-down pairs of Havaianas or Old Navy flip-flops for far too long now, log on to TerraCycle to sign up for the brigade. Once you have a full box of sandals, you can print off a prepaid UPS shipping label to ship off your box at no cost.