"Plastic shields" refers to protective barriers made of a sturdy, see-through material that are used to shield or cover something to keep it safe from harm or contamination. Full definition
There's a full complement of analogue gauges that appear to be sealed behind a protective plastic shield in case the vehicle gets caught in the rain. (articles.orlandosentinel.com)
These are large rolls of thick plastic shields that cover the spaces in between your balcony posts. (ohmyapt.apartmentratings.com)
Had she practiced and planned for driving rain, wind and flying plastic shields in the court? (sportstarsmag.com)