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