This is a really solid helmet, for skiing or other action sports. Lots of space for stickers, great quality and a great style. I use this helmet 80% of the time. Its probably a warmer weather helmet though, so if you are skiing in the arctic or canada or whatever, this is probably not for you. I use them a lot for spring park laps.
In terms of fit, I took a chance and ordered in medium which fits my head perfectly. I would recommend NOT doing this however, because I got really lucky and could have been screwed over.
My main problem with these was that the strap was a little bit difficult to adjust, but once you have it sorted out they work great.
Overall, I would recommend them to most people in warmer environments or not skiing pow. It doesn't have tons of crazy features like adjustable vents, but it is light and works great for what it is.
Definitely a buy for those looking for a park helmet.