SMARTSILK Twin Duvet and Mattress Protector Set Shell - 100% Cotton, Fill - 100% Silk Imported Certified asthma and allergy friendly as tested by Allergy Standards limited in Dublin, Ireland Scientifically proven to be an effective barrier to allergens including dust mites and pet dander Naturally processed and resistant to mold and mildew growth Made of breathable materials scientifically proven to wick away moisture Machine washable, dryable and fire retardant