Buying any PPE from Amazon is probably a bad idea. Counterfeit or not, the barrier to entry is just too low.

eg, there are specialized climbing harnesses on Amazon which confuse the CE EN standard and the concept of notified bodies. (Which certify conformity.) Leads to hilarity like a climbing harness claiming conformity with the standards for intubation tubes.

Or, climbing equipment which is mislabeled as to its country of origin, with basic specs like dimensions being inaccurate.

The sellers just don't care, and Amazon doesn't care enough to stop them. It's barely one step above ebay for a lot of items.