Upanbike Adult Bike Helmet Mens Bike Helmet Riding Helmet One-Piece Adjustable ?Impact resistance Light weight:Outter material is tough and durable PVC PC, inner material is EPS foam which help absorb the impact and protect the head during crash. The helmet is made of lightweight material, it weights only 200g. ?Adjustable dimension:This helmet is specially designed for adults both men and women rider. It's suitable for 22''~25'' head circumference. It goes with a standard size, equipped with the easy-use dial system and side straps make this helmet adjustable to different head size. ?Aerodynamic and ventilation design: The ventilation holes allow air to go through the cycle helmet,helping increase the speed and keep stay cool. ?Visor design:The special design of visor,you can enjoy cycling even in hot days,and the visor can be removed when you do not need it. ?The inner pads and chin pad are made of breathable material, soft and comfortable.They can be easily removed for wash and can be easily attached back to the helmet.