STRONG PROTECTION: High-density imported PC case with superior technology will surely improve safe performance. Bicycle helmet with durable hard shell, soft pad can absorb the pressure caused by external impact. Adults wear our bike helmet will feel safer and more comfortable, it will protect you in all directions. MAGNETIC GOGGLES: Detachable Magnetic Goggles Visor Shield can be used as a sunglasses, Not only protect your face against wind and sand, But also can block the strong sunlight. Its easy to flip up or remove with one hand when cycling. USB RECHARGEABLE REAR LIGHT: Bike Helmet included plug-in USB rechargeable LED light, 3 Lighting Modes will help riders behind you clearly recognized your direction, more Safer in night cycling. The helmet rear light is durable, can Lasts for 30+ hours in fully charged. COMFORTABLE VENTILATION DESIGN: This Bicycle helmet could provide great performance in reducing air resistance and sweating, ventilation design allow air go through the cycling helmet which help increase the speed and keep stay cool and comfortable. TWO SIZE OPTION: Adult bike helmet with Dual Fit adjustable design, There is a adjusting knob at the back of the bike helmet, helping to adjust the head circumference. Adjustable Size: 20.5-24.4 inch (52-62cm),