Allersoft 100-percent cotton dust mite & allergy standard duvet protector allows you to encase your duvets and is an integral part of your allergy prevention solution. Allersoft is one of the more recognized allergen barrier fabric names in the market and unlike the competing products, Allersoft is made in the USA. The membrane free fabric is a patented, high construction piece of material and is an effective barrier to dust mites and allergens. There is no urethane or membrane on the back of the fabric which gives it that cool, smooth feeling you get with your best cotton sheets. The standard size measures 21 by 27-inch. It is easy care machine wash and dry.