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Biker mask is an excellent price alternative to the Frogmask with its KN95 filter also removable and two exhalation valves, for those who are concerned about fogging or exhaled CO2.
The Biker respirator is available in one size only, but as it is very soft and stretchy, it is suitable for all adults. It's a no miss accessory for cyclists and bikers.
Biker mask is not a Frogmask mask.