Have been using Nolan for some time. Recently upgraded and having break in issues on same size as usual,guessing my head has swollen the temple and forehead are painful after an hour. Most other models were not this tight.
I have had two head scraping events and the chinguard held its own.
Mine came from a non US locale and didn't search for certification stickers as its never been questioned since about '74 by a bored Houston PD officer who measured my reflective stickers for compliance just looking for anything to write a young guy a ticket and asked who painted the helmet and removed stickers... Not worried about having one now...Ill play the old guy card now
You bring up an interesting thought- Does sizing or head or both or neither change? When I replace say, my neotec with a neotec II can I be certain the sizing is the same as my 6 year old Neotec? If I were certain, I'd be more cost-comparison conscious re: vendors. (vis a vis return policy and price)