I wear these with my helmet when wearing armor isn't possible... or comfortable. It's pretty cool that Bungie made these. I recommend that everybody buy at least two of these shirts... you never know when they're going to retire the item from the store.
Ugghhh they're back up!? I saw these when they were first released, then when I decided I should get one for a halloween party, went to get them and they were gone... and now they're back but it's too late to get them for a party.
Let that be a lesson, if you want it, buy it immediately!