Wool Diaper Covers breathe the best!!!! Wool is naturally antibacterial. I have found wool to be so easy to care for - as you don't need to wash as often. Just let it air out and smells are gone. If poop gets on it, soak in a bucket with some wool wash for 20 minutes, squeeze out and hang dry. When I use wool covers, my baby never soaks through and has no problem with rashes.