These mask inserts are made from a very thin aluminum that is easy to bend to fit the contours of anyone’s face. Easy adjustability helps create a better seal against the face for added protection and is also very effective at preventing foggy glasses! The back side of the insert has an iron-on fusible so that you can iron the insert in place on the mask. When flat these are approximately 3.5" long and 3/16" wide (5mm x 90mm).
Package includes 5 inserts.