View attachment 1645425 Some real data from Klim's website. Impressive comparison between Koroyd material and conventional helmet EPS during impact: https://www.klim.com/Krios-Pro-Helmet-ECE-DOT-3610-000 Safety data directly from Koroyd. Risk of traumatic brain injury ( HIC ) reduced from 77% to 5% with Koroyd. Significant improvement over conventional EPS : https://koroyd.com/koroyd-helmet-safety-initiative/ View attachment 1645425 I can only comment from unboxing the Krios Pro and comparing to my existing Arai XD-4. I have to test the helmet in real world. I am still nursing non-displaced fractured lower T9 rib and shredded ankle tendons from second degree sprain from recent Baja trip. Sand will do that to you. My observations from owning Arai XD-4. From design perspective: - The Krios Pro is super light by comparison. - The Krios Pro out of the box ready Pinlock visor looks much more clear and less distorted. - Visible design ventilation looks significant on Krios Pro. - The design in removing visor and beak on Krios looks far easier than Arai XD-4. - Cheek pad lining and inside liner on Krios feels softer. Almost like velour. Cheek pad design is better in Krios. Velcros in place. - Buckle chin lock on Krios is much easier than D ring. - Chin ventilation looks more on Krios. - I can slip Krios on much easier with small in ear earbuds; although my Arai XD4 size Medium has a much narrower entry vs. Krios Pro in Large Ultimately I have to post a real world observation. I'll try to include noise level, how it handles in rain, fogging, and other environmental.