Our most popular flat surgical mask, preferred for its comfort and breathability. A fluid resistant, tie-on surgical mask with horizontal ties, this mask is ideal for surgical and general-purpose use.Greater than 99% BFE and Greater Than 95% PFE. Lightweight, three-layer construction is comfortable to wear. Designed to fit a variety of facial shapes and sizes. Does not contain either natural rubber latex or dry natural rubber as components in the product or its packaging to eliminate concern of latex reaction. Non-fiberglass