I’ve been using .03" PETG film, and it works wonderfully as a rigid shield. I’ve got some .02" that I want to try because the .03" is just a little too rigid for my taste. That said, mine were designed (and approved by the NIH) to be re-usable/sterilizable. If yours are too, make sure you’re using “closed cell” foam, as otherwise you’ll never stand a chance of sterilizing it.
I’d be careful with Latex. You need to make sure that if you’re donating them that whatever facility you want to send them to allows latex. The model that I was making got bounced originally because it contained latex.
When in doubt, check with the Infection Control specialist at the facility, they should be able to tell you yay or nay.