Those are made for much harder hits, than a standard bike helmet. Probably good for the patch of ice you don't see, that puts you on the ground, before you even realize you're falling. The nice thing is that the ABS shell will deform ans take some the impact, even if the foam inside cracks or shatters. (which, is a failure mode, and not how helmets are supposed to work) I wear a park style helmet, at the mountain bike trails I ride at. I have no faith in a standard cycling helmet to protect me from branches and sharp rocks. The paper thin shell makes it too easy to point load the foam, preventing it from absorbing any impact, and letting the things poke right through.

Just remember, no helmet will protect you from the impact that happens inside your skull. Be careful out there.