Anyone use disposable sanitary covers for the Rift?

I'm looking for some type of disposable sanitary covers and came across these (direct amazon links, no affiliate #'s). Has anyone used these types/styles? Do they actually work good to protect from sweat? I'd like to throw a VR demo party for my friends but I don't want everyone's nastiness seeping into my Rift. I've seen the more expensive covers but I'd rather just have disposable one's.