The HJC RPHA 31 Dereen MC5SF is a premium open-face motorcycle helmet designed for riders who want advanced protection, quiet performance, and adaptable comfort. This medium-size helmet uses HJC’s Premium Integrated Matrix (PIM) Evo shell, combining carbon-aramid hybrid and natural fiber reinforcement for enhanced shock resistance, reduced weight, and long-term durability. The elongated shell profile and extended chin EPS provide a more encompassing, full face-level fit while preserving the open-face design.
Engineered through wind-tunnel testing, the HJC RPHA 31 helps reduce aerodynamic drag, wind turbulence, and riding noise at speed. Its ventilation system uses two intake vents and four exhaust vents to promote full front-to-back airflow, helping maintain a comfortable interior during changing riding conditions. The included HJ-39 Pinlock 120XLT DKS467-ready shield provides 99% ultraviolet protection and features an anti-scratch coating for lasting optical clarity. A shield holder helps reduce noise and drag while securing the visor firmly in place.
The integrated smoke-tinted sun visor features an anti-fog coating and operates through a convenient bottom-positioned control system. Its multi-step adjustment allows the visor to move up to 10 millimeters closer to the rider’s face for customized shading and improved comfort. The RPHA 31 also accommodates second-generation SMART HJC Bluetooth communication systems, sold separately, for convenient connectivity while riding.
The RPHA Premium Fit interior uses advanced antibacterial fabric with moisture-wicking and quick-drying performance. Removable, washable crown and cheek pads, three-dimensional contouring, and interchangeable cheek pads across helmet sizes support a personalized fit. Reflective materials improve visibility in low-light conditions. Manufacturer: HJC. Brand: HJC. Model: RPHA 31 Dereen MC5SF. Size: Medium. Vendor part number: JA19NUS52S5V. This helmet is designed for motorcycle and powersports riders seeking premium open-face coverage, stable aerodynamics, and versatile everyday fitment.
Features:
- Premium Integrated Matrix (PIM) Evo shell: Uses carbon-aramid hybrid and natural fiber reinforcement for enhanced impact resistance, comfort, and durability.
- Open-face design: Provides an extended, full face-level fit through an elongated shell and extended chin EPS.
- Aerodynamic shell: Wind-tunnel-developed profile helps reduce air resistance, turbulence, and noise while improving stability at speed.
- Ventilation system: Two intake vents and four exhaust vents promote front-to-back airflow.
- HJ-39 shield: Pinlock 120XLT DKS467 ready with 99% UV protection and an anti-scratch coating.
- Integrated sun visor: Smoke-tinted, anti-fog visor deploys through a bottom-positioned control system.
- Adjustable sun visor: Multi-step positioning allows the visor to move up to 10 millimeters closer to the face.
- SMART HJC compatibility: Accommodates second-generation HJC Bluetooth communication systems, sold separately.
- Premium fit interior: Antibacterial fabric provides moisture-wicking and quick-drying performance.
- Removable comfort padding: Crown and cheek pads are removable and washable for easier maintenance.
- Customizable fit: Three-dimensional cheek pads and interchangeable pad options support individualized comfort.
- Visibility enhancement: Reflective materials help improve rider visibility in low-light conditions.
- Brand and model: HJC RPHA 31 Dereen MC5SF.
- Size: Medium.
- Manufacturer and vendor part number: HJC JA19NUS52S5V.