@TalktoBeverley@sb in North America, the red straps are used exclusively on 3M's Aura 1870+ N95. Their Aura N95 non-surgical respirators have blue (9205+) or white (9210+). Same APF, though. As an aside, I don't understand why, but it seems rare for a respirator to be submitted for N99 certification. The Aura 9205+ N95 scored 99.7 in masknerd's tests and the Vflex 9105+ N95 scored 99.4. iirc, only the made-in-🇨🇦 Vitacore CAN99 scored higher among the FFRs he tested, at 99.9. Obv the tests are specific to his face, so ymmv.