The Cool Luxe Waterproof Mattress Protector could possibly be the most important accessory you add to your ChiliSleep sleep system! Not only is it a barrier to possible moisture, it works hard 24/7, keeping you cool as you fall asleep, and protecting you from microbes, bacteria and fungus. It also protects your mattress from all of the other allergens like dust, dander & dust mites. Best of all, it can add years to the life of your mattress by protecting it from naturally-occurring elements.