Features： 1、IMPACT RESISTANCE: This bike helmet is specially designed for adult rider. Impact resistant PC is not easy to crack and high density EPS foam inside helmet absorb impact energy effectively to minimize the risk of harms to head in crash. 2、LED SAFETY REAR LIGHT: The adult bike helmet LED Light is with 3 Safety Red lighting modes - steady, slow flashing and fast flashing. Warn Cars keeping a safe distance and help other riders behind you clearly recognized your direction,Safer and Brighter in Night Cycling. 3、DETACHABLE GOGGLES: The bike helmet Detachable 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. Bicycle helmet with 3 strong magnet, the goggles can be flipped up or down, which not interfere with wearing your own glasses. 4、VENTILATION: The bicycle helmet 9 breathable vents, effectively reduce air resistance and reduce sweating.The adoption of aerodynamic and ventilation design allow air go through the biking helmet which help increase the speed and keep stay cool. 5、ADJUSTABLE: The bicycle helmet is designed with a square protection system. There is a adjusting rod at the back of the bike helmet, helping to adjust the head circumference. It is very important for you to get helmet on head properly because potential dangers occurs easily with small or big size helmet. please measure your head circumference correctly before purchase, This helmet fits head circumferences 22.44 to 25.98 in. Specification： Material: Shell PC internal EPS Technology: In-Mold Head circumference: about 57-66cm (22.44-25.98in) Inner width: about 17.5cm (6.89in) Weight: about 320g Ventilation holes: 9pcs Taillight capacitor capacity: 200mAH Charging time: about 3H Use time: about 60H Use crowd: adults, unisex Application: road mountain bike Structure: External IN-MOLD (integrated molding) impact resistant PC, internal EPS integrated molding to absorb impact technology Applicable scenarios: cycling, cross-country, roller skating, skateboarding and other outdoor sports Package List： 1*Helmet 1*Goggles 1*USB Cable 1*User Guide