In order, the helmets I've had are a random velvet helmet, IRH helmet that looks like a GPA, CO Hampton, GPA, and finally the CO Wellington. The Hampton gave me headaches, GPA doesn't (it's my schooling helmet now), CO Wellington gives me headaches if I wear it all day. BUT my head is round, not oval. GPAs are round, CO helmets are oval. A GPA would give someone with an oval head headaches. So, you have to determine if your head is round or oval