Search results list several common materials: polyethylene, polyester (including listings marked 100% polyester), non-woven cloth, and fleece.
Most listings are one-size or labeled for women and are intended for adults and teenagers. One product example lists a head circumference of 24.8"; other entries simply state adult or women's sizing.
Decorations in the results include floral elements (green flowers, vine/rose flowers and leaves), and some variants add accent details such as black flowers or skull decorations on the brim.
Listings position these hats for Halloween and general festive use: Halloween parties, carnivals, masquerade balls, haunted-house props, photobooth props, and similar celebrations.
They are marketed both ways: as costume headwear and as décor/props, with listings describing them as costume accents, haunted-house or photobooth props, or decorative pieces.
Search results include height and brim specs such as a 16" hat height with a 17.3" brim diameter (reported brim circumference 54.3") and other heights like 15.75" and 14.75" shown in different listings.