Available in 8"depths -  Knit fabric w/ urethane top and bottom - Self-Locking Zipper w/ unique patented tape closure to form a complete seal preventing bed bugs from getting in or out -  Easy to install for 8" deep box springs.  Breathable design - Dust Allergen Proof - Laboratory tested and certified bed bug proof !! Lab results available upon request - Machine Washable for re-use