Organic 100% Cotton Allersoft Dust Mite & Allergy Pillow Encasings are free of all chemicals, dyes, additives, resins, finishes, and bleaches. Natural organic cotton pillow encasings are not only good for you, but they are good for the environment too! This brand new fabric is made of 100% Certified Organic Natural Cotton, and the revolutionary technology in the construction of this fabric allows for total breathability with the feel of soft cotton linens, while still providing complete protection against dust mites and their allergens.