EBaySurrounds the box spring on all 6 sides with a durable high-grade polyester surface material Exclusive Micro-Zipper technology. 360 Secure zipper feature prevents accidental openings by sealing the end zipper traveler with a Velcro flap Polyester Exclusive 360° Velcro Flap with Micro-Zipper 's patented zipper and enclosure completely seal your box spring on all six sides. The micro zipper also spans three sides of the encasement for easy installation and removal. For peace of mind, the micro zipper's teeth are so small and tight that not even a stage I bed bug nymph can pass through. The secure velcro enclosure then seals off the end of the zipper traveler to ensure it can't accidentally pull back allowing bed bug to enter or escape. Smooth Polyester Surface To prevent the box spring encasement from making noise or retaining heat, 's designers created a proprietary smooth polyester resulting in a soft, high quality and durable material for the encasement. Vinyl, phthalates and PVC Free Waterproof Breathable Membrane Protect your box spring spring from fluid spills like sweat and urine with 's exclusive membrane layer. This unique design blocks any fluids from reaching the box spring while still allowing the box spring to breathe. 'S waterproof membrane is free of vinyl and PVC, phthalates or fire retardant chemical treatments. Box spring encasements are perfect for adults and children along with allergy and asthma sufferers. Easy Cleaning... Machine Washable Washing: Machine-wash with your sheets using normal household detergents that do not contain bleach. Drying: Tumble dry on low heat together with your bed sheets, towels or other clothing. Do not iron and do not dry clean. Box spring encasements are designed to block allergens, bed bugs, fluids and dust mites Protects against bed bugs, allergens, dust mites, perspiration, urine, and fluids Soft, smooth, and noiseless polyester surface Breathable membrane allows airflow while repelling liquids Micro-zipper technology for the ultimate bed bug protection 360° Secure design prevents accidental openings Surrounds and protects the box spring on all six sides Completely waterproof and noiseless Prevents bed bugs from entering or escaping