Additionally, guests may purchase Popcorn Perks, which entitles them to 36 free medium-sized popcorns in a 12-month period. Harkins previously sold loyalty T-shirts, which allowed guests who wore it to a Harkins to be entitled to receive a free medium-sized popcorn during each visit throughout the year. The Popcorn Perks program replaced the T-shirt program, setting a limit on how many popcorn vouchers a guest may redeem per year to how many "Perks" the guest has purchased. A portion of every Popcorn Perk sold goes to Phoenix Children's Hospital Center for Cancer and Blood Disorders.