Features： 1、【Lightweight and safe】MTB helmet consists of high-quality EPS (expanded polystyrene) foamed polycarbonate shells, so it is very durable and comfortable to wear and can absorb an impact to protect your head and offer more safety. 2、【Breathable】Special aerodynamic design and 18 breathable ventilation holes in the bike helmet effectively reduce air resistance and sweating. The removable insect net protects your head from insect bites while riding in warm and humid conditions. 3、【General size】The size of the bike helmet is adjustable (54-64 cm), suitable for adults, men, women. for mountain biking and racing bikes in the city or suburbs. 4、【More protection】:The bicycle helmet is specially designed for mountain bikers who experience adventure on hiking trails. It provides more head and face protection, and the sun visor can shield your face from the sun and occasional branches. Specification： Material: EPS pellets + PC sheetColor: red and black, black and white, white and red, green and black, blue and black, white and blacksize: one sizeSuitable head circumference: about 54-62cm, adjustableApplicable gender: neutral Package List：