Just oxygen-permeable. I also keep my cheese in an air-permeable bag in the fridge - if there's no bag, it dries too fast, if the bag is not air-permable the c

Just oxygen-permeable. I also keep my cheese in an air-permeable bag in the fridge - if there's no bag, it dries too fast, if the bag is not air-permable the cheese gets sweaty and gross.