Brand Name: Giant Origin: Taiwan (China) Lens coating: Uv protection coating High-concerned chemical: none Item Type: EYEWEAR Sport Type: cycling Gender: Unisex Material & Structure: PC Impact Shell + Aerospace-Grade EPS Liner Weight/Size: Net Weight 220±10g ---Adjustable 52-62cm Head Circumference, Glasses-Compatible Safety Certifications: CE EN1078 & CPSC 1203 Certified Ventilation System: 18 Airflow Channels +5℃ Cooling Effect in Hot Weather Additional Features: Surface coating reflective technology+6 types of lights, +80% Night Visibility Choice: yes semi_Choice: yes