They usually are packed raw and comes frozen or freeze dried up.
Rexene is also a famous material used for gloves. But still you can find so many gloves associated with this material as these components is cheap so I guess maybe people dispose them after this quick use so that they can easily new. https://www.youtube.com/channel/UCFE6qpvSvg5BIx2nYJz3jvg/about