Independently lab tested and certified bed bug entry, escape and bite proof * Surrounds the box spring on all 6 sides with a durable high-grade polyester surface material back coated with a water, bed bug and allergen proof membrane layer (great for those with asthma and allergies) * Exclusive Micro-Zipper technology prevents all stages of bed bugs from passing through the zippers teeth * 360 Secure zipper feature prevents accidental openings by sealing the end zipper traveler with a Velcro flap * 10-year full replacement warranty and machine washable (registered with the FDA as a class 1 medical device)