Maintain the perfect balance of airflow in your helmet with the RPHA 91 Rear Vent, specifically designed as a replacement part for the RPHA 91 series. This rear vent is crucial for expelling hot air from inside the helmet, promoting a continuous flow of cool air to keep you comfortable on your ride. Crafted with precision to match your helmet's original design, it's made from durable materials to ensure longevity and performance. The RPHA 91 Rear Vent is easy to install, making it an essential update for any rider looking to preserve the helmet's cooling efficiency and overall comfort, ensuring a more enjoyable and focused riding experience.