I ordered directly from Boneheads website. The measurement recommendation tool was spot on with the size. It fitted me for a large helmet, which I was worried would be a little too big, but this thing fits like a glove. Outstanding construction inside and out. The carbon fiber lay is absolutely beautiful, the audible altimeter pockets are a huge plus, and the face shield mechanism works perfectly. If I flip the shield down too long before leaving the aircraft, the lens will start to fog up at the bottom, but the small vent allows any fogging to immediately dissipate. Like other reviewers have stated, it's a little tricky to find a spot to mount a GoPro, but I'll give that up for the superior construction any day. I highly recommend this helmet.
