Let me add my endorsement. We've had a dry summer and fall here in Canada's prairie provinces and once the crop was off our access to trails is greatly increased. However ripping across a dry stubble field at 60mph with half a dozen other zany dirt-babies tends to clog the sinuses rather quickly. The Wolfsnout was the answer. It might make you look like an American Werewolf in London, but it does the job and damned well. What was surprising to me was how little it restricted breathing - not at all - and that it didn't make me sweat. Good purchase.