well, since I might be trying a few test/tune sessions to see how the truck runs...I need a helmet. (they're required anything under 13s right?) while I don't KNOW if I'm in the 12s...I sure as heck hope I am! Driveshaft loops are needed faster than 13, right?

anyway...how do I size the helmet? looking at jegs, some are listed with hat size, which I already know mine, but some are listed with maybe a head circumference? where to I measure that? around my forehead above the ears? or is there a head "height" measurement?--for the full face helmets

what do you all prefer? full face helmet or open face? I'm leaning towards full face, but my only experience with helmets was a loaner at an indoor go-kart track near K-town, Germany