Jason Hockey Jersey and Mask Costume - Standard - Chest Size 44 This Friday the 13th Jason costume includes a jersey shirt and EVA mask. Jason&#039;s jersey is 100% polyester and hand washable; machine wash cold, hang to dry This jersey for men is an officially licensed Friday the 13th costume. The adult Jason Hockey Jersey and Mask comes in sizes X-Small, Small, Standard, X-Large. Pants are not included with this Friday the 13th costume.