Neoprene face mask with N99 filter could prevent virus, dust. Generally, there are 5-layers in the filter. The activated carbon layer could protect against airborne allergens and harmful gas, and the melt-blown layer could prevent bacteria and viruses.

Dust and exhaust are the biggest hazards on city roads . Cyclists need special cycling masks to protect themselves from dust. Biking sports masks are consisted of reusable face mask shell and replaceable filter to prevent pollution, pollen, dust and bacteria, and virus