It's never been a problem for me. I'm strange though, I get sick about once every 5-6 years, not even a cold. I can walk right through poison ivy and it doesn't bother me at all, don't know why. My high school girlfreind was the same way, never got sick, poison ivy never effected her either. BTW Estes Park is a neat little town, was there in the late 80's checking out RMNP.