The HJC RPHA 31 Dereen MC21 is an open-face motorcycle helmet designed for riders who want advanced protection, refined aerodynamics, and everyday comfort. This XL helmet features HJC’s Premium Integrated Matrix (PIM) Evo shell, which combines carbon-aramid hybrid and natural fiber reinforcement materials to help improve shock resistance while maintaining a light, comfortable construction. The multi-density EPS liner supports impact energy management, while the elongated shell and extended chin EPS provide a more encompassing fit with full face-level protection.
Developed through wind-tunnel testing, the RPHA 31 shell helps reduce air resistance, wind turbulence, and riding noise for a stable, composed experience at speed. Two intake vents and four exhaust vents create front-to-back airflow to help manage heat during changing riding conditions. The included HJ-39 Pinlock 120XLT DKS467-ready shield provides 99% UV protection and features an anti-scratch coating. The shield holder is engineered to help reduce drag and noise while keeping the visor securely positioned.
The integrated smoke-tinted sun visor uses an anti-fog coating and deploys through a convenient bottom-positioned control system. Its multi-step adjustment allows the visor to move up to 0.4 inches closer to the face for more personalized shading and visibility. The RPHA Premium Fit interior uses advanced antibacterial fabric with moisture-wicking and quick-drying performance. Removable, washable crown and 3D-contoured cheek pads support easy maintenance and a customized fit, with interchangeable cheek pads available throughout the size range. Reflective material adds visibility in lower-light conditions.
Compatible with second-generation SMART HJC Bluetooth communication systems, sold separately, the HJC RPHA 31 is suited for riders seeking integrated connectivity without distracting from the road. This helmet is manufactured by HJC and carries manufacturer and vendor part number JA19NUS7221V. The XL size and Dereen MC21 configuration should be matched to the rider’s head measurement and preferred fit before purchase.
Features:
- Size: XL
- Model: RPHA 31 Dereen MC21
- Brand: HJC
- Manufacturer part number: JA19NUS7221V
- Vendor part number: JA19NUS7221V
- Shell construction: Premium Integrated Matrix (PIM) Evo with carbon-aramid hybrid and natural fiber reinforcement
- Protection: Multi-density EPS liner with elongated shell and extended chin EPS for an encompassing fit
- Aerodynamics: Wind-tunnel-developed shell helps reduce air resistance, turbulence, and noise
- Ventilation: Two intake vents and four exhaust vents provide front-to-back airflow
- Face shield: HJ-39 Pinlock 120XLT DKS467-ready shield with 99% UV protection and anti-scratch coating
- Sun visor: Integrated smoke-tinted, anti-fog visor with multi-step adjustment
- Interior: Antibacterial, moisture-wicking, quick-drying premium fit fabric
- Comfort: Removable and washable crown and 3D-contoured cheek pads
- Fit customization: Interchangeable cheek pads available throughout the size range
- Visibility: Reflective material for added low-light visibility
- Communication compatibility: Designed for second-generation SMART HJC Bluetooth communication systems, sold separately
- Fitment: Intended for motorcycle riders requiring an XL open-face helmet; confirm head measurements and fit before use