Comfortable and Ventilation:Bicycle helmet designed by specialized aerodynamics and ventilation with 18 air vents, effectively reduce air resistance and discharge the hot air in the biking helmet, improves the internal air flownd and reduce sweating to help increase the speed and keep stay cool. This bike helmet perfect for long rides and comfortable to wear. Multifunctional design Sports Helmet This Bike helmet with unique design of sun visor for protect your face from rain, wind and dust, and prevent strong UV rays. The sun visor is detachable,you can take it off when you don't want it. The helmet inside is lined with removable pads, high-performance pad design for increased comfort and easy cleaning and keeping fresh smelling helmet. Soft chin padding protects your chin from discomfort. Adjustable Size Bike Helmet Bike helmet with ddial retention system design and a adjusting knob at the back of the bike helmet, helping to adjust the head circumference, ensuring a comfortable fit. This helmet fits head circumferences 22 -24 in (56 - 61cm).Used comfortably by adults and seniors. Excellent Crash Resistance and LightweightOur bike helmet is specially designed for riders, adopts high-density EPS and durable and tough PC materials. Outer shell tough durable, high density EPS foam inside helmet impact energy effectively absorbed to good shockproof and protection effect to minimize the risk of harms to head in crash. Only 320g weighing bike helmet,it is comfortable to wear for a long time and will not cause any burden to the rider's head during cycling. Great GiftThis bicycle helmet is a ideal gift for you, your family on Birthday, Christmas,Thanksgiving.