Rubies Costume Co Boys' Ghostbusters Inflatable Slimer Costume The Slimer costume for kids includes an inflatable jumpsuit, headpiece, sleeves & gloves. Our Slimer costume for kids comes in child size One Size. This costume stays inflated with the included battery operated fan. Batteries not included. This Slimer costume for kids is an officially licensed Ghostbusters costume. Pants are not included with this inflatable Slimer costume for kids.