i31 Open-Face Helmet. Shell: Advanced Polycarbonate Compound: By blending high-grade polycarbonate with high-impact strength and ABS in an optimal ratio, HJC has developed a shell that is both strong and impact-resistant while maintaining a lightweight design. Wind tunnel-tested. Ventilation: "ACS" Advanced Channeling Ventilation System: Full front-to-back airflow flushes heat and humidity out of the helmet. Visor (Shield): Pinlock Ready HJ-43 Visor: Provides 99% UV protection, anti-scratch coated. Distortion free visor (shield). Sunshield (Sun Visor): Black Dark Smoke installed. Distortion free sun shield (sun visor). Interior: