This Healthy Home mattress protector is treated with Proguard antimicrobial finish. The antimicrobial treatment is on the fabric and guards against degradation and reducing odors caused by microorganisms. This mattress protector has a soft 233 thread count 100% cotton cover, with waterproof backing and stain release finish to provide your mattress with additional protection each night as you sleep. This product does not protect the user or others against pathogens. The fully encased jersey knit skirt will fit up to a 14" mattress for Full, Queen, King and California King size, and 11" mattresses for Twin and TwinXL. With the L-shaped zipper opening being positioned in the middle of the encasement, makes this easy to remove for laundering.