The HJC RPHA 31 Dereen MC21 is a premium open-face motorcycle helmet designed for riders who want dependable protection, reduced wind noise, and long-distance comfort. This medium helmet uses HJC’s Premium Integrated Matrix (PIM) Evo shell, combining carbon-aramid hybrid and natural fiber reinforcement materials to improve shock resistance while maintaining a lightweight, comfortable design. Its aerodynamic shell profile helps reduce air resistance and improve stability at highway speeds.
The HJC RPHA 31 includes an HJ-39 Pinlock 120XLT DKS467-ready shield with an anti-scratch coating and 99% ultraviolet protection. An integrated, smoke-tinted dynamic sun visor features an anti-fog coating and deploys through the convenient bottom-positioned mechanism. Multi-step adjustment lets riders position the sun visor closer to the face for improved shading and personalized visibility. The shield holder helps reduce drag and noise while maintaining a secure shield fit.
Ventilation is provided through two intake vents and four exhaust vents for consistent front-to-back airflow. The RPHA Premium Fit interior uses advanced antibacterial fabric with moisture-wicking and quick-drying properties. Removable, washable crown and cheek pads, three-dimensional cheek pad contours, reflective safety material, and interchangeable cheek pads across helmet sizes support a comfortable, customized fit. The elongated shell and extended chin EPS provide full face-level coverage while preserving the open-face configuration.
The RPHA 31 is compatible with second-generation SMART HJC Bluetooth communication systems, sold separately, allowing convenient integration for calls, navigation, and rider-to-rider communication. This helmet is the HJC RPHA 31 Dereen MC21 model in Medium size, manufactured by HJC and identified by manufacturer and vendor part number JA19NUS5221V.
Features:
- Size: Medium
- Model: RPHA 31 Dereen MC21
- Brand: HJC
- Manufacturer: HJC
- Manufacturer part number: JA19NUS5221V
- Vendor part number: JA19NUS5221V
- Shell: Premium Integrated Matrix (PIM) Evo construction with carbon-aramid hybrid and natural fiber reinforcement
- Protection: Multi-density EPS and extended chin EPS provide enhanced impact protection and full face-level coverage
- Shield: HJ-39 Pinlock 120XLT DKS467-ready shield with anti-scratch coating and 99% UV protection
- Sun visor: Smoke-tinted, anti-fog dynamic sun visor with multi-step positioning
- Ventilation: Two intake vents and four exhaust vents provide front-to-back airflow
- Interior: Removable and washable crown and cheek pads with moisture-wicking, quick-drying antibacterial fabric
- Fit: Interchangeable three-dimensional cheek pads support a personalized fit
- Safety: Reflective material improves rider visibility
- Communication: Compatible with second-generation SMART HJC Bluetooth communication systems, sold separately