Available 5 types of suspension as replacement for MSA V-Gard safety helmet. l Fas-Trac: Adjustable head band by dial ratchet knob [US & EU] l Staz-On: Adjustable head band by sliding [US] l Push Key: Adjustable head band by sliding and releasing by pushing utton[EU] l 1-Touch: Easy squeeze opening and One-Hand slide adjustment [US] l Swing The only self-adjusting reversible ratchet Ratchet: suspension [US]