SLEEP TITE ENCASE Box Spring Protector - Six-Sided Zipper Encasement - Eliminates Bed Bugs - 100% Waterproof-Eliminates Dust Mites -15 Year Warranty, CAL KING cotton Six-sided bed bug proof protector with end zipper completely encases box spring - accommodates box springs depths up to 10 inches 100% Waterproof and hypoallergenic material helps eliminate dust mites and allergens Vital component of a complete bed bug, dust mite and allergen elimination system Stops the passage of bed bugs to and from your box spring - a mechanism for both treatment and prevention Bed bug infestations often result in itchy, bloody bites, emotional distress and high extermination or relocation costs