My Arc' Cerium just came in. It's a little big

Which is strange, because I tried on the Cerium LT in the outerwear store in Toronto and a Large fit me better than a Medium. I ordered the Cerium SV, thinking it'd fit the same as the LT, but apparently not?
Back in Vancouver now, gonna head over to the Arc' store later and try on different sizes.
Luckily Liveoutthere has free shipping and returns.