One of the best things you can do to help prevent your baby from having allergies is to use dust mite barrier bedding -- an actual barrier that goes between your baby and the places dust mites live. This simple mattress encasement easily slips over your baby's crib mattress and under your stylish crib sheet to provide the ultimate in allergy relief and prevention. And because it's made from a cotton poly/blend, you never have to worry about compromising the breathability of the mattress.