All of our face masks offers 2 layers of protection, helping with the prevention of transmission via respiratory droplets. V1 has a soft hypo allergenic non-toxic cotton outer layer with the inner layer made of cooling polyester textiles (copper integrated yarn). V2 has a high quality non-toxic pro cool performance fabric on both layers with the inner layer integrated with copper yarn technology. V3 has a high quality non-toxic pro cool performance fabric on both layers with the inner layer infused with nano silver technology.