Zamp RZ-38 DIRT SNELL SA2025ZAMP Racing Helmet RZ 38 DIRT Lightweight Dirt Racing Ready Zamp Racing RZ 38 DIRT helmet, a Snell SA2025 certified helmet built specifically for dirt racers who demand protection, comfort, and focused performance. Featuring the same proven shell as our standard RZ 38 model, the DIRT version is optimized for off road use with reduced venting to block out dust and debris. This model includes a pre installed upper chin curtain to prevent dirt and debris