Split King SureGuard Box Spring Encasement Pack - 100% Waterproof, Bed Bug Proof, Hypoallergenic - Premium Zippered Six-Sided Covers - 10 Year Warranty 100% Waterproof - Six-sided premium protection against everyday liquids and stains; 10-year quality guarantee Bed Bug Proof - Super fine zipper with Invisi-Zip and SureSeal technology completely seals off the box spring from bed bugs - use with a SureGuard Mattress Encasement Hypoallergenic - Blocks dust mites, allergens, bacteria, mildew and mold - providing health benefits for the whole family Soft & Noiseless - Smooth stretch-knit surface hugs to your box-spring like a glove - Free from Vinyl, PVC, Phthalates, fire retardants and other toxic chemicals King (2 pieces, 39 in x 80 in) - Fits 8 to 11 inches deep; Zippered Box Spring Covers - Machine wash and dry. Independently lab tested and GREENGUARD Gold certified.