An alien beanie is usually one of two things: a plain knit cap with embroidered alien artwork, or a novelty cap shaped with antennae for costumes and photos.
- Knit construction: cuffed versus uncuffed, rib gauge, and whether a fleece lining is mentioned for real winter use.
- Fiber content, since acrylic holds shape and color cheaply while wool blends breathe better and itch more.
- Graphic method: embroidery and woven patches survive washing far better than printed or heat-pressed designs.
Stretch varies by knit, so compare the flat measurements a seller posts against your usual hat size.