Clean Rest Simple Bed Bug & Allergen Blocking Box Spring Encasement Featuring Zip-N-Click - Queen CleanRest SIMPLE Box Spring Cover is to be used in conjunction with the the SIMPLE Mattress Encasement. Certified 100% Bed Bug Entry, Escape and Bite Proof. Breathable - Washable - Blocks Allergens Surrounds and protects the box spring on all 6 sides against allergens, dust mites, bed bugs, bacteria, and perspiration (5-year warranty and machine washable) MicronOne surface material with breathable hypoallergenic membrane backing keeps the mattress cool and quiet while blocking dust mites and other allergens (great for those with asthma and allergies) Secure zipper closing with Zip-N-Click prevents accidental openings by sealing the end zipper traveler with a secure cap.