The F-Dual is a single-lens mask with a unique assembly of lens and skirt without a frame. The mask design bonds a high-grade silicone double-feathered edge skirt directly to a single tempered glass lens. The silicone facial is assembled directly on the glass with no need for a frame. This system ensures good visibility in all directions. The low internal volume allows for easy clearing and the quick-adjust strap buckles are molded directly into the skirt for a flexible fit and less drag. The F-Dual mask has a wide split strap design for comfort and to give even-tension on the skirt for a proper seal.