I'm looking to grab a new helmet. Have been using my company issued Petzl Vertex non vented but when doing side jobs it's a little confusing for clients as it has the company logo on it. I'm looking to just get another Vertex, I like the helmet I have already, although open to other suggestions. Other than the obvious insulation value non vented has for electrical hazards (I don't do line clearance); is the vented helmet significantly different in terms of keeping on cool or weight? I have a mop of hair so it gets pretty damn hot up there.