First, I did not wear this on the snow so I cannot comment on warmth in actual use. I ordered the Giro Seam and Smith Vantage because I could not decide which I liked best. My old helmet was a Giro MX10 that I have had for 6-7 years and it was time to upgrade. I have Oakley Crowbar goggles. I went with the Giro helmet for several reasons. First was fit. Maybe it was because my last helmet was a Giro, I just liked the way it fit better overall. Second, the chin strap on the Smith hangs straight down and felt like it would rub my neck during use. The Giro is angled more forward so it does not hit my neck. Third, with the goggles on, the brim and goggles rubbed together and made an annoying clicking noise. Maybe not an issue with the wind whipping past and Smith goggles would probably fit better. Lastley, parts of the plastic size adjustment are not covered by the liner and rubbed the sides of my head. While I did like the lower profile and the 2 sets of vents, in the end, the Giro just felt better.