I'm wearing my Rubies Jango helmet now....I'm 5'9, at 175 lbs, have a regular sized head I'd imagine cause there's nothing weird about it like huge nose, overbite or big ears & the helmet feels roomy enough to stick a computer fan in it. I mash the helmet to the front of my face & the cheek parts touch my cheeks but my nose doesn't press on the visor...I'm debating whether I should get a thin layer of padding for the top of the helmet cause without it my eyes are completely level with the eye holes...I can stick both of my hands up in the helmet over my ears without flexing the helmet out any further.
Unfortunately the Rubies Jango is the only Mando helmet I've ever had on so I can't compare it to other makes, y'know what I mean? I look at myself in the mirror wearing the helmet & nothing else, the helmet seems huge to me but it look normal sized when I put on my armored up vest so I can't imagine what it would feel/look like to have a helmet that's bigger than this adult-size Rubies.