Materials vary by item: costume apparel is often 100% polyester; many character masks are molded from plastic (including ABS); and bulk masquerade masks are typically made from cardstock paper.
The listings cover both adults and children: some items are labeled for Adult use, while others are intended for kids commonly marked 5+ years, 6+ years, or 8+ years.
Openings vary by design: some masks have only a mouth opening, others include both eye and mouth openings (and some list eye, mouth, and nose openings), and certain molded masks are listed with no openings.
Some masks feature light-up effects or light-up lenses, and others include electronic voice-changing functionality, as noted in the product descriptions.
The plus-size costume is offered in larger adult sizes—2X, 3X, and 4X—and is described as tailored for comfort in those sizes.