Color: white, black, red, silver, fluorescent green, gradient blue, gradient purple Material: EPS foam + PC shell Applicable head circumference (CM): 55-62 Helmet inner size (CM): 22*17 Whether integrated: one Helmet stomata number: 21 Product matching: none Product size (CM): 27*21*14 Product weight (G): 220 Specifications: 1. Powerful protection: The outer shell of the helmet is made of ultra-light PC plastic, which meets American bicycle safety standards. The inner lining material is high-quality EPS foam, which can absorb impact well and provide more protection for cyclists. 2. Ventilation and ventilation, in line with aerodynamics: professional aerodynamics and ventilation design, 21 vents, let air through the bicycle helmet, help increase speed and keep cool 3. Lightweight and comfortable, light weight and no burden: This bicycle helmet is made of lightweight materials to keep the weight to a minimum without sacrificing the safety of comfortable wear 4. Humanized design: This adult bicycle helmet adopts standard size, and the head circumference can be adjusted to the best 5. Multi-color options: The helmet has a variety of colors to choose from, with bright colors, smooth appearance, and good gifts! Package Included: 1*helmet