The FM100-B face mask features a hook & loop closure and covers the middle of the neck. The FM100 face mask is made of a special fabric by Marina company, and features a hook & loop closure and a ring at the top of the head and another hook & loop closure at the base of the head. Designed with our proprietary fabric, the FM100 Face Mask features a hook & loop closure on the top of the head and another hook & loop closure at the base of the head. This face mask is also available in No Neck and Long Neck coverage.