Milliard Box Spring Cover, Use Encasement For Allergy and Dust Mite Cover, Hypoallergenic and Bed Bug Proof,, California King (36"x84"9") Cotton-blend Milliard box spring encasement, covers and encases your box spring to give you the strongest Bed Bug cover out there. Provides relief for allergy and asthma sufferers from dust mites and mold spores. The ultimate box spring protector. Stretchable fabric makes installation simple and easy. Extremely durable seam work for long lasting use. Includes two 36" x 84" box spring encasements for divided California King-sized platforms. Machine Washable, Tumble Dry Low Heat.