Spamster, that's there to tighten down the hood for when it's windy or whatever. It esentially does the same function as drawstrings in the front, but makes the entire hood fit snugger rather than just the front part around your face. That's dope, actuallyMakes sense now that you say it. Figured it must do something. It was cold like four days here last year so my experience with wind and hoods is minimal.