Black Biosmart Antimicrobial Fabric, 65% Poly 35% Cotton, 12" x 30" . BioSmart Antimicrobial Fabrics feature a patented technology that binds chlorine from EPA-registered bleach to the surface, inhibiting the growth and spread of bacteria and killing up to 99.9% of common bacteria and viruses. BioSmart™ is a patented Milliken technology that binds chlorine bleach from the wash cycle to the surface of the fabric. Products with BioSmart technology must be washed with an EPA-registered chlorine bleach to charge the fabric prior to each use. BioSmart technology is durable up to 75 launderings.