Now I am assuming that by the way this phrase is worded that allergy mattress covers has something to do with mattress covers for allergies. And I would assume that one might be looking for those allergy mattress covers if they have some type of allergy to dust mites or bedbugs. Bedbugs? Wow. And from what I hear, most of that city of New York and who knows what other cities could use one of those mattress casings for the battle of the bedbugs, maybe. And with National Allergy's mattresses, pillows, covers, blankets and air purifiers, battling those bedbugs, dust mites and allergies can be just a website visit away.