They look like rollerblade/skateboarding helmets to me. Maybe they are just calling them biking helmets?

I thought there was a difference in how biking helmets and skateboarding helmets are constructed, to protect you in the different types of impact.

The skateboarding helmets I get to check out at the rink and also my own skating helmet, are quite flexible shells, and the foam in side is a totally different kind of squishy foam from my biking helmet styrofoam lining.

Makes you wonder.