I find the best combination is the Clarity Aloft worn with a skydiving helmet that doesn't cover the ears.
It is cooler in hot weather and you can put the helmet on after the headset.
No idea about head protection but I have assumed that skydiving helmets should be quite good. In an accident I think you are most likely to be thrown forward so protecting the forehead is important.
Clarity Alofts are quite fragile as you have to remove the earpieces by pulling on the wires. Eventually they break. Fortunately CA are quite reasonable about warrantee claims and repairing them.