The Protect-A-Bed 4-pack STANDARD size ALLERZIP Smooth Pillow Protector keeps your pillow clean, allergy-free and bed bug proof for a healthy night's rest. The Protect-A-Bed Miracle membrane barrier promotes a healthy sleep environment by protecting you from dust mites and other allergens that may lurk in your pillow, including mold, mildew, pet dander, and pollen. The Protect-A-Bed waterproof pillow protector extends the life of the pillow by blocking accidents, spills and stains, yet is air permeable to keep you dry and cool. Bed bug bite-proof, entry-proof, and escape-proof with patented BugLock Secure three-sided zipper. Certified asthma and allergy friendly by the Asthma and Allergy Foundation of America (AAFA). Entomology lab certified bed bug proof pillow protector. Good Housekeeping quality tested and approved. FDA Class 1 Medical Device. Safety tested and certified by the standard 100 by Oeko-Tex. Smooth, flexible jersey knit polyester fabric.