So, I did a thread a while back on a dirt mask and someone recommended that I try a Respro Techno Gold. They aren't actually for mowing. They are designed really for cyclists, but so far it has worked pretty good. When I first got it it was a little uncomfortable and I'm not sure if I broke it in or got used to it but it feels pretty comfy now. It has replaceable filters and looks pretty cool (I kinda look like scorpion from mortal combat). Breaths easy and doesn't let anything but fresh clean air in. I've only been using it for two days and my allergies have improved tremendously. Needless to say I highly recommend the mask so far, but like I said I've only had it for two days. Here is a pic: My only complaint is that it took around a month to get here from the UK. Also, the filter has to be replaced after a month of use, and they aren't just real cheap.