[【Safety Protection】- Shinmax bike helmets with tough and poly-carbonate shell and EPS foam helps slow down the impact and provide your head with maximum protection and comfortability in all directions during crash. 【Adjustable Size & Quick Release System】Cycling helmet can be adjusted to fit different head circumferences 22.05"-24.41" (56cm-62cm) for both adult men and women. Both the back regulator and side straps are adjustable. Quick-release buckle makes the helmet cycling easier to put on or take off your adult bike helmet. 【Detachable Magnetic Goggles】- Unique magnetic visor shield design can be used as sunglasses not only protect your face against wind and sand but also block the strong ultraviolet light UV400 protection. Bicycle helmet with 3 strong magnet make the goggles shield can be flipped up or down. 【Ventilation 7 Holes】- Streamlined design adult helmet in special aerodynamic design and 7 breathable vets effectively reduce air resistance and reduce sweating. Super lightweight 310g (0.68 lb) bike helmet no more burden keep staying cool and comfortable. 【Gifts for Adult】- The bike helmet adult is protective and ideal for urban commuting cycling skateboarding; also suitable for city road electric trek bike and etc.]