The only helmets I am aware of here in the US that use the Koroyd are from Smith Optics, and they make helmets that use both. I had one of their helmets and I took a bit of a hit: mud on the bike path and I slid out. One of three road bike crashes in the past 10 years. All due to small patch of mud on a multi use trail.
Speed prior to the impact was 12 MPH. No noticeable impact injury to me. Minor damage to the helmet.
https://www.smithoptics.com/en_US/helmets-bike/