Allergy free mattress cover in king size by Science Of Sleep. The science of sleep "Allergy Free" product is manufactured with an "Always Fresh" anti-bacterial, anti-fungal cover and a non-allergenic mildew proof convoluted polyurethane foam cover. The Always Fresh Protective Product is treated to guard against bacteria, mold, mildew and fungal growth which is a natural breeding ground for allergy causing dust mites. The anti-microbial treatment keeps the protective cover "Always Fresh" as it self deodorizes.Wash cover in luke warm water, mild soap, air or tmble dry, gentle cycle. Repeated washing may reduce anti-microbial treatment. The Premium Quality Foam Mattress Cushion 100% convoluted Polyurethane Foam is hypo-allergenic and flame retardant. An ideal allergy free product for those allergic to feathers, fibers and dust particles. The product is also odorless, mildew resistant and keeps its shape for years.