Tough and durable: Bike helmet is made of EPS Foam and high-density imported PC shell with superior technology will surely improve safe performance while cycling. The EPS Inner soft pad shell can absorb the pressure caused by external impact,helpful to decrease the impact forces of the collision. 3 modes LED back light: This bicycle helmet for adult riders comes with a specialized bike LED light to help you stay highly visible while riding at night. Warn commuter cars and help bikes on the street by clearly signaling when you pick between 3 modes: Slow Flashing, Fast Flashing, or Steady. Magnetic goggles and removable sun visor: Detachable Magnetic Goggles Visor Shield can be used as a sunglasses, Not only protect your face against wind and sand, but also block the strong ultraviolet light, it is UV400 protection. Bike helmet also can used with a single sun visor or both visor and goggles. One helmet can fit for mountain bike and road bike cycling. One size fits all function: 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 as your request. Adjustable Size: 22.44-24.4 inch/57- 62 cm. This mountain bike helmet is suitable for adults both men and women size. Ventilation 17 vent-Light weight and super cool: Bike helmet men with special aerodynamic design and 17 breathable vents, effectively reduce air resistance and reduce sweating,weight with visor only 288g (0.63 lb) will not cause any burden to the rider's head during cycling.