Instruct: Classify a given Amazon review as either positive or negative.
Query: Doesn't form a seal.

Bought this pair of earplugs as a replacement for some sound earmuffs that broke. Having had more luck with ear plugs in the past, I arrived at this low cost option. I was sorely disappointed. The plastic was hard and didn't form a seal in my ear at all. The case it comes with is very difficult to open, too. Sorry, MSA, I'll think twice about purchasing from you again.