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, 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, 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, Do not recommend washing foam mattress products the flame retard, SKU: HDSN004