Originally Posted by Ferrari353
I have a POC Skull Light helmet, and it's main use is obviously skiing/snowboarding as it has ear covers. The ear covers are removable though, so that's why I'm wondering if it could then be used for mountain biking. Without the ear covers, it looks to me like a normal helmet, but I can't seem to find anywhere that explicitly says it can be used for biking.
There are some differences between the EN 1077 (ski) and the EN 1078 standard (bike). For example, the bike standard includes testing impacts against a "kerbstone" shaped anvil - EN 1077 does not.
Let's say all that is not really critical for you - the next question is comfort. Ask yourself if you really, really want MTB-levels of sweat inside your (unvented!) snowboard helmet. If you were a roadie, there would also be the issue of weight and having to crick your neck up, but you've probably got a more upright position on your MTB.
A cheapo bike helmet or even a cheapo Protec-type multisport helmet would be more comfortable. An actual honest-goodness POC bike helmet would meet the 1078 standard -and- be more comfortable.