MSA Safety - MSA 10148708 - Suspension, Fas-Trac III, 4 point

Fas-Trac III Replacement Ratchet Suspension, 4-point Standard-sized; for V-Gard, V-Gard 500, V-Gard GREEN and SmoothDome Helmets
Flush rear lug attachments eliminate pressure points
Three levels of nape strap adjustment for customized fit
Graspable ratchet with ultra-smooth rotation and steadfast hold
The ratchet comfort pad contours to the back of the head to improve airflow and prevent hair-pulling