Make that a too small helmet as well. I got the BRP GSX-2 (Scorpion EXO, says so on the inside of the chin bar

hyea

and I got a small at first. Noisy, windy, fogged up like mad....absolutely
hated it. It started falling apart after two months so I sent it back for warranty and upsized to a medium at the same time. I was leery when I got the new one, but thought I would try it.
Awesome helmet. At 28F I could go without a balaclava, little to no fogging, no more cold wind blowing up behind the chin bar and into my eyes making me tear up. And no it isn't too big, still fits snug, doesn't "rattle around" on my head in cross winds.