Description: Cycling helmet with sunglasses for adults- Lightweight breathable, luminous, anti-impact, high-density and comfortable. Made of high-density EPS foam and PC shell with in-mold construction provide full protection for your head. Easy use adjustable dial and makes it different head circumference 56-63 cm/22-24.8 inches. There have vents keep enough ventilation to keep you cool and reducing wind resistance. The ultra light helmet won't add burden to your head after long time wearing. Specification: Material: EPS, PC Size Chart: Head Circumference: 56-63 cm/22-24.8 inch Head Width: 18.5 cm/7.3 inch Head Length: 23 cm/9 inch Package Includes: 1 Piece Bike Helmet Note: Only Blue White and Red White have luminous effect.