Ah ha, a question I can answer! Carefresh is a kind of substrate that comes recommended for small critters like mice and geckos . I think its made of compressed paper? Well, its compressed something. It has a bit of a funny smell, and I know it sets a couple of people with allergies off, though.sasandcol said:Sounds like a stupid question but what is carefresh that i sometimes read about on here? I'm still a novice to this mouse talk :?