Before you unbox or interact with your B2 Mask, wash your hands with soap and water. Be sure to scrub all surfaces of your hands and in between your fingers for 20 seconds.
Okay, ready to go!
The larger portion of the liner should match up with the bottom of your facepiece.
Turn your facepiece over so that you are looking at the inside.
Tuck the bottom of the liner (larger portion) inside the lip at the bottom of your facepiece.
Tuck the remainder of the liner around the inner edge your facepiece.
Check the liner to make sure that it is securely inserted along the inner edge of your facepiece. The liner should not obscure your filters.
Wash your liner by hand using dish soap and water. Wring out the extra water and let it sit to dry in a sanitary location.