This lightweight adults cycling helmet is constructed from hard plastic shell and shock-absorption EPS foam,which can provide maximum guard for you.It Features 13 air vents,adjustable dial,removable mesh liner,rear light,removable magnetic goggles that bring much protection for you. Features: Strong plasticshell and EPS foam absorb shock and impact,provides better guard for you. Removable magnetic goggles reduce the harm of strong sunlight while keep your face and eyes from wind,sand and dust. Wideneddesign of goggles,friendly for glasses wearer,no need to take off glasses(not included). Removable rear light builts in a 500mAh rechargeable battery,5lighting modesfor warning and lighting in dark riding. Adjustable dial makes the helmet fit head sizes: 57-61cm / 22.4-24.0in. Removable and washable mesh liner inside keeps helmet clean,fresh and odor free. 13 breathable flow vents keep you cool. Adjustable strap with chin pad for comfortable fit. Specification: Color: Black / White / Grey / Blue (optional) Material: Plastic + EPS Head circumference: 57-61cm/ 22.4-24.0in Battery: 1* built-in 500mAh lithium battery Size: 273*175*132mm / 10.7*6.9*5.2in Weight: approx. 320g / 0.7lb Package List: 1* Helmet 1* Magnetic Goggles 1* USB Cable