When can I add Xtra Boosts to my entry? When you're almost finished with your entry, then you'll have an opportunity to apply Xtra Boosts. Related articles Contact Us I joined FLX Rewards at Champs Sports. May I still use my benefits at Foot Locker? How many Xtra Boosts can I apply to each release? If I create two accounts, then can I combine them? What happens if I neither confirm nor refuse my win?