I have been riding/driving offroad vehicles for over 20 years....finally a product I can actually recommend..... I have been using wolfsnout dust masks for a few years now and I can honestly say....WHOA!!!! what a difference it made. I can finish my rides without hacking up mud from my lungs and no more blowin sand boogers from my nose. I have asthma and the mask is incredibly efficient in removing particles that cause chest tightness....I do not need to use my inhaler after a ride anymore.....just an amazing product that makes me think....why didn't i think of this!