I just checked every single Giro helmet and every one is certified. Something that not many other companies can say. Also like I said. They cover more of your head than most helmets. Which is pretty obvious why it would be safer. And another is that the hard padding in it is thicker than most other helmets. When you get down into the 60 dollar range though they are gonna be a little less safe than the top line from another company. The most important though is to make sure it fits.
I ride TSG Fly - one of the lightest winter helmets on the market (370g/13oz). Very comfortable, almost like a beanie. Actually already second, because first one was creviced (hope this is right word, cuz I don't speak eng very well ) after a bad landing of jump and catching heel edge on ice... Thanks helmet, I could enjoy snowboarding later that day. I was lucky, because it happened second day after I bought it, and guys in the shop gave me a new helmet for free. Now the exterior is little bit damaged after some crashes on rails, but it's still ok.
Dunno if it meets the best standards, but it's certified CE EN 1077b, ASTM 2040. Explained here: CEN 1077 - Fiswiki
I highly suggest a Giro Revolver. I wear a 7 1/2 new era hat and surprisingly can fit in a small in this helmet. I have Von zipper Fishbowls which helps making the helmet look small. i wear it with a skull cap so its low profile and the goggles under the helmet using the interior goggle channel. Try this set up at your shop and you won't be disappointed. if your looking for a low profile look this helmet is best. it almost looks weird since its so small haha