The new P.R.P.L. (Pull, Ratchet, Push, Lock) or “Purple” hard-hat ratchet system from Degil allows easy one-handed size adjustment and fit. To adjust, pull sizing knob out of locked mode, ratchet or turn sizing knob to desired size and fit, then push sizing knob inward to engage the locked mode. Available for The Wave ANSI Type-I and CSA Class E hard hats.Degil Safety Products, Inc., Woodbridge, ON, Canada.