This is exciting news!
I discovered just last week that Giro fit me better than other brands I have tried. I am typically in between a small and medium in a lot of brands, but not Giro. I bought a small Strata helmet and it's perfect. I can adjust to make room for a thin wool head covering, and I can snug it down when I don't have anything under it. It stays in place and fits perfectly with the Giro Ella goggles I got, which are the only pair I own that don't fog during all this mask wearing we are doing right now.
So, if you're a woman whose head measures about 54-55 cm around, Giro might be the brand for you.