I received an order confirmation for a replacement helmet (won't see it until the end of the month) so I let curiosity get the best of me. The ENTIRE top and much of the sides are Koroyd. I'm very pleased to see this much in there. The EPS is around the lower perimeter where you need to attach things or have dedicated vent channels. The carbon layup on the shell is clean and consistent. The vents above the shield not only head to your forehead, but also channel up on top of the Koroyd. That's why this thing feels so airy. Klim was awesome with the warranty, so I will just share this one photo so owners in this thread and those considering the helmet here on ADV can see under the hood. Ride on!