This is the 505th most frequent Slovenian word.
zaščitnih
"Protective."
The word 'zaščitnih' is used to describe the 'glasses' as offering protection, acting as an adjective in this construction.
Nosil je par zaščitnih očal med delom.
He wore a pair of protective glasses while working.
Here, 'zaščitnih' modifies 'ukrepov' (measures), indicating that the measures serve a protective purpose.
Pri gradnji hiše uporabljamo veliko zaščitnih ukrepov.
During house construction, we take many protective measures.
In this example, 'zaščitnih' describes 'sredstev' (products) that are intended to provide protection, explaining their purpose.