Serta Waterproof Defender Plus Mattress, California King, White cotton_blend Imported Double jersey cotton blend top to absorb liquids and a waterproof polyurethane coated back to protect mattress from fluids Fits mattress depths from 9 to 20 Inch Sanitizedantimicrobial agent to help control orders caused by mold, fungus and mildew growth Care instructions: Easy care machine washable