Anyone use filters with Canon 15x50s?

I'm going to be doing some traveling with my Canon 15x50 IS binoculars and I'd like to have some sort of protection for the front elements. I understand the arguement against compromising image quality, and I could just buy something cheap to put on the front while in transit, then remove them for observing. After having the binocs out in a heavy mist this weekend, I'm thinking a pair of high-quality multicoated UV filters to leave on while observing might be a good idea. Is anyone doing anything like this? Any feedback on degradation of image quality? Thanks.