The HJC RPHA 31 Dereen is a medium open-face motorcycle helmet designed for riders who want advanced protection, low noise, and comfortable airflow in an aerodynamic package. This MC6HSF model features HJC’s Premium Integrated Matrix Evo (PIM Evo) shell, constructed with reinforcing materials including a Carbon-Aramid Hybrid and natural fibers. The multi-density EPS liner is engineered to help manage impact energy while supporting a comfortable, lightweight fit.
Wind-tunnel-developed aerodynamics help reduce air resistance, turbulence, and riding noise at highway speeds. A full front-to-back ventilation system uses two intake vents and four exhaust vents to promote continuous airflow. The integrated smoke-tinted sun visor includes an anti-fog coating and can be adjusted through multiple positions for personalized coverage. Its bottom-mounted operating system allows quick deployment while riding, and the visor can be positioned up to approximately 0.4 inch closer to the face for improved shading. The included HJ-39 shield is Pinlock 120XLT DKS467 ready, anti-scratch coated, and provides 99% ultraviolet protection.
Comfort and fit are supported by HJC’s RPHA Premium Fit interior, which uses advanced antibacterial fabric with moisture-wicking and quick-drying properties. The crown and cheek pads are removable and washable, while interchangeable cheek pads allow riders to fine-tune the fit. Reflective material adds visibility in low-light conditions, and the elongated shell with extended chin EPS provides extended full-face-level coverage while retaining an open-face design. The shield holder helps reduce drag and noise while keeping the visor securely positioned. The HJC RPHA 31 also accommodates second-generation SMART HJC Bluetooth communication systems, sold separately.
Fitment: Designed for motorcycle and scooter riders seeking a medium-size open-face helmet with integrated sun protection and communication-system compatibility. Manufacturer: HJC. Brand: HJC. Model: RPHA 31 Dereen MC6HSF. Vendor part number: JA19NUS52H6V.
Features:
- Premium Integrated Matrix Evo shell uses Carbon-Aramid Hybrid and natural-fiber reinforcement for enhanced impact resistance, comfort, and reduced weight
- Multi-density EPS liner helps absorb and manage impact energy
- Aerodynamic shell developed through wind-tunnel testing to reduce air resistance, turbulence, and riding noise
- Full front-to-back ventilation with two intake vents and four exhaust vents
- Integrated smoke-tinted sun visor features anti-fog coating, quick bottom-mounted operation, and multi-step adjustment
- HJ-39 shield is Pinlock 120XLT DKS467 ready, anti-scratch coated, and provides 99% ultraviolet protection
- RPHA Premium Fit interior uses antibacterial, moisture-wicking, and quick-drying fabric
- Removable and washable crown and cheek pads support easy maintenance
- Interchangeable cheek pads allow personalized fit adjustment across helmet sizes
- Reflective material improves visibility in low-light riding conditions
- Compatible with second-generation SMART HJC Bluetooth communication systems, sold separately
- Manufacturer: HJC; model: RPHA 31 Dereen MC6HSF; medium size; vendor part number: JA19NUS52H6V