Got a few Petzl Vertex vent helmets recently. Light, vented, easy adjustment via thumb wheels. one size fits all which means its a bit bigger than needed shell than guys with small heads like me. In bike helmets there are sizes for a closer fit profile, oh well. Webbing inside with air space between helmet top and your head. Great place to store bandana, warm cap, etc. Only weak point is the chin strap is too far forward, very near your eyes, and the chin strap snap is small and hard to unlatch after a few hours of hand work.
Also got a Kask super plasma. I like the ear muffs they sell that snap on, very good ones. Better chin strap and latch. Also, Kask adds bike helmet like styrofoam material between the cron of your head and the top of the helmet. No storage there but maybe better protection.
Both are good, i have the ground man wear the Kask, and climber wear the Petzl figuring ground needs more protection from falling stuff, climber needs lighter and more vents.
of course the cool kids get Phanner helmets with Seneca radios built in, maybe someday....