I dunno it has been going on a while at my store and they were still doing it Saturday. Student discount is 15% off and you just need student ID. The policy is to apply it on top of promos (25% off vests, 30% off sale, etc.) but not transaction discounts (25% off total purchase). Some stores won't let you stack, but ask for a manager and they might. Both stores near me allow it, but sometimes new employees don't know.