I already owned a Seirus Ultraclava (Amazon.com: Seirus Innovation Ultra Clava: Clothing
) but I decided to give the Under Armour face mask a try on my recent trip to Snowbird.
It got tested in some fairly chilly conditions. Lots of snow the first two days. Daily high temperatures of 5ºF and 11ºF.
Even though the UA face mask has a better fit & adjustment than the Seirus Ultra Clava (the Seirus constantly shifts lower on my face/mouth/chin), I give the UA face mask a huge FAIL for snowboarding.
Breathing heavily through the UA mask kicked most of that moist breath right into my goggles (Smith I/O), where it would cause them to fog up very quickly if I wasn't moving. It got so bad on the coldest day that the lenses on my I/O froze up completely. I had to stop and switch lenses because it was impossible to see through the iced up lenses.
In all fairness, the breath fog problem I had with the UA mask is a problem that any face covering without holes can cause. The UA mask does it more because it stretches under the goggles easier than the Ultra Clava does.
Another problem I had with the UA mask on the cold days was that the mask itself also froze up. At the end of the 11ºF day, the part of the mask that covers the nose and mouth was stiff and cold with frozen breath. This is probably due to how thin the UA mask is. The ultra clava has gotten just as wet, but has never frozen on me.
Basically, in my opinion, the UA mask is only suitable for warmer (~25º or above) temperatures or groomer days that won't leave you breathing heavily (as this will fog up your goggles). If the mask had holes in it, then this would fix the fogging problem I had, but you would still have to be careful to keep it from freezing.
I do like how the UA mask fits, so I will still bring it with me on my trip to Jackson in a few weeks