A microfiber barrier fabric that offers completely “undetectable” protection against dust mites and bed bugs. While exceptionally strong, this luxuriously soft fabric is made of ultra fine fibers resulting in a fabric which is finer than the most delicate silk. The specially formulated fabric is made of tightly woven yarns that block out allergen molecules of less than 3.03 microns in size. Zip and Block specially design features a extra long rustproof zipper, inner and outer flap closure to ensure maximum protection, and additional binding on inner seam for durability. Fits Mattress 15″ Deep.