Thanks, y'all! Cashel was the brand I borrowed. Thanks for the links!
Here's another one -- do you have a favorite place to buy kids' riding helmets? Well, I guess I'd buy one for me, too.
I don't really have a favorite online place, but State Line Tack is a big one.
I'd probably buy something like that in person if you have any kind of tack shop nearby, so I could try on different ones.
For a brand of helmet, I'd go with a Troxel if you're just going to school and not show. They're lightweight, durable and they have vents in the top so they breath easy and you have ventilation to your head. Makes a world of difference, believe me.