The POC Cortex Flow helmet is a bit different than its Cortex DH big brother. The exterior shell is made of fiberglass, with a polycarbonate inner shell. So it's a more durable shell than the carbon fiber on the Cortex DH, but it's also a bit heavier. While it takes external design cues from the Cortex DH, the vents channel air directly into the helmet, through holes in the shell that are aligned with a like pattern in the EPP liner. In reality, it ventilates better than the DH version because of this direct flow path for fresh air. The chinguard is positioned just right to provide coverage but ensure you can still breathe easily on hot days as you sprint from one berm to the next. The Cortex Flow helmet meets all the European and US safety standards. As mentioned, it vents better than its DH big brother. But the DH is a much more robust helmet with its double layer construction and MIPS technology. If you're prone to bailing but live for high-speed excitement, do yourself a favor and go for the DH version of the Cortex Helmet.