【High Impact Resistance】This bicycle helmet uses lightweight, high-density EPS foam, which has an outstanding effect of reducing and mitigating strong impact forces from the outside. In addition, the ultra-high rigidity PC shell and built-in chin pad absorb and distribute the impact, minimizing damage to the head. 【Excellent Breathability】Multiple ventilation holes designed based on aerodynamics promote airflow inside the cycling helmet, making it less stuffy and providing a more comfortable fit. The removable inner pad is easy to clean, preventing bacteria and odors, and keeping the bicycle helmet clean at all times. 【Ultra-Lightweight & Adjustable Size】The road bike helmet weighs only 285g, making it feel light enough not to feel the weight, reducing the burden on the neck and head wobble, and providing a comfortable ride. The size of the head circumference can be adjusted from 56 to 61cm with the adjustment dial on the back of the bicycle helmet, ensuring a comfortable fit according to the size of the head. 【High-Brightness LED Tail Lamp】The helmet is equipped with a high-brightness LED tail lamp, which increases visibility to the surroundings and greatly improves safety even during night riding. With just one button, you can freely switch between three lighting modes (constant light, gentle flashing, rapid flashing) and use them as needed. 【Active in All Scenes】It is very useful not only for mountain bikes and road bikes, but also for commuting, going to school, surfing, skateboarding, hiking, and other scenes. ✣ I bought it last year, but I didn't use it at all, and I bought a new one this summer, so I don't need it anymore. ✣ There are no scratches or stains.