I think there is a resurgence in hardshell bike helmets.

I don't think I've ever crashed my bike and hit my head while riding the bike, so the one-time-use helmet doesn't really make a big difference to me. A helmet is more likely to wear out from use than impact.

Whereas I believe a skateboard or snowboard helmet is designed to take multiple impacts. I have a ProTec boating helmet that is identical to a ProTec (kid's) bike helmet.

Good ventilation, of course, is nice during the summer.