Originally Posted by mtnwalker

I tried the Respro Techno? mask. It seems to work and the air I breath feels cleaner when I tried it walking around the street. BUT I have only used it once for commuting and haven't touched it again in months.

The day I used it it was 51F outside commuting home and sunny. I had trouble breathing when I have to draw in large breaths, I sweated a lot under the mask, and it was very uncomfortable at high cadence because, again, it restricted air flow. I felt having to take in deep breaths which is not that comfortable while on a bike for an extended period of time. It may work great if you really pace yourself, but I can't imagine having that on when you especially need it: summer and hot. Like anything else though, YMMV.