If youve been thinking about building your own fly rod, I cant recommend this Epic Ready To Wrap kit enough
Theyre usually designed to be removable for cleaning purposes or swapped out for another shield/ visor

Shell: Injection molded alloy composite modular shell Aggressive shell design with aerodynamic shape for sleek performance 2 shell sizes: XS-2XL / 3XL-5XL Shield: Clear Pinlock-ready face shield Drop-down tinted sun visor Internal drop-down sun shield Comfort: Multi point surface mounted airflow ventilation system including chin, forehead, and metal mesh rear exhaust vents Removable moisture-wicking comfort padded lining and cheek pads using a antimicrobial finishing material to help keep your helmet fresh Safety: DOT approved Double D-ring safety retention system Quick release push button chin-bar operation Bluetooth: Integrated Sena DWO-6 Bluetooth v4.1 system WAVE Intercom compatibility eliminates distance and device limitations: Connects riders using any brand of Bluetooth or Mesh comm system (read more) Wave App is free and available on the Google Play Store or Apple Itunes Up to 4-way intercom support Voice operated phone and intercom communication Automatic audio boost in noisy environments Phone conference Music sharing Speed dial Last number redial Max intercom distance of up to 1000m (0.6 miles) Up to 8 hour talk time w/ 7 day stand-by time Smartphone app supported Compatible with Sena Remote Control devices (sold separately) Read More

Advanced ventilation, enhanced visor stability, and 6Ds fifth-generation Omni-Directional Suspension system work together to provide consistent airflow, impact protection, and rider confidence wherever the ride takes you
It's hard to measure Turbo mode correctly because you need to hold the switch to ramp to Turbo, but it also drops directly, so the time interval of the Lux meter (at 5 seconds) is not the best to see the actual peak performance
Good luck and tight lines!