The HJC RPHA 31 Dereen MC21 is a large open-face motorcycle helmet designed for riders who want premium protection, refined aerodynamics, and enhanced everyday comfort. Built with HJC’s Premium Integrated Matrix (PIM) Evo shell and multi-density EPS, this helmet combines carbon-aramid hybrid and natural fiber reinforcement for strong shock resistance with a lightweight, comfortable fit. Its elongated shell and extended chin EPS provide expanded full face-level coverage while preserving the open-face riding configuration.
Designed through extensive wind-tunnel testing, the RPHA 31 shell helps reduce aerodynamic drag, wind turbulence, and riding noise at highway speeds. The ventilation system uses two intake vents and four exhaust vents to promote front-to-back airflow, helping manage heat during extended rides. The included HJ-39 shield is Pinlock 120XLT DKS467 ready, features an anti-scratch coating, and provides 99% UV protection. An integrated smoke-tinted sun visor uses an anti-fog coating and deploys through a convenient bottom-positioned mechanism. Its multi-step adjustment allows the visor to move closer to the rider’s face for more personalized shade and comfort.
Comfort and usability are supported by HJC’s RPHA Premium Fit interior, which uses advanced antibacterial fabric with moisture-wicking and quick-drying properties. The 3D-contoured crown and cheek pads are removable and washable, while interchangeable cheek pads allow riders to refine the fit. Reflective materials improve visibility in low-light conditions, and the shield holder helps reduce noise and aerodynamic drag while securing the visor. The helmet is compatible with second-generation SMART HJC Bluetooth communication systems, available separately. This HJC RPHA 31 Dereen MC21 helmet is manufactured by HJC and identified by manufacturer and vendor part number JA19NUS6221V.
Features:
- Size: Large
- Model: RPHA 31 Dereen MC21
- Brand: HJC
- Manufacturer Part Number: JA19NUS6221V
- Vendor Part Number: JA19NUS6221V
- Helmet Type: Open-face motorcycle helmet with full face-level fit
- Shell Construction: Premium Integrated Matrix (PIM) Evo shell with carbon-aramid hybrid and natural fiber reinforcement
- Impact Protection: Multi-density EPS liner designed to improve shock resistance
- Aerodynamics: Wind-tunnel-developed shell reduces drag, turbulence, and riding noise
- Ventilation: Two intake vents and four exhaust vents provide front-to-back airflow
- Face Shield: HJ-39 shield with 99% UV protection, anti-scratch coating, and Pinlock 120XLT DKS467 compatibility
- Sun Visor: Integrated smoke-tinted, anti-fog visor with multi-step adjustment
- Interior: Antibacterial, moisture-wicking, quick-drying premium-fit fabric
- Fit Adjustment: Removable, washable, and interchangeable 3D-contoured crown and cheek pads
- Visibility: Reflective material supports improved visibility in low-light conditions
- Communication Compatibility: Designed for second-generation SMART HJC Bluetooth communication systems, sold separately