1、Adjustable Fit: The bike helmet for adults features a dial system and side straps for easy adjustment, fitting head sizes from 52-61cm, both men and women, ensuring a comfortable and secure fit for every rider. 2、Premium Guard: Constructed with a high-density PC shell and one-piece EPS foam, it has excellent shock absorption and drop-proof, so can effectively reduce impact and provide you with dependable safety. 3、Cooling Ventilation: Strategically placed vents enhance airflow through the helmet, improving cooling efficiency and reducing overheating during long rides, while the light design minimizes pressure on the head. 4、Easy to Wear: The road bike helmet is lightweight and can be easily adjusted to fit securely on the head, promoting convenient wear without straining the neck or head. The quick-release button allows for easy removal. 5、Wide Compatibility: The comfortable helmet is suitable for various activities such as city, road, and leisure cycling, providing versatile guards for all riders. Also, it is a great gift for a birthday, Christmas, or other festival. Crafted from a lightweight out-mold construction with an enduring PC shell and shock-absorbing EPS foam. Designed with every detail in mind, they provide a secure and safe experience for all your activities. Thanks to the ventilation openings in the helmet shell without compromising stability ensure sufficient ventilation and keep your head cool. The adjustable strap of 52-61cm can meet the satisfaction of most cyclists. Model: 601 Material: PC+EPC Head circumference scope: 52-61cm Item Size: 28x21x15cm/11.02x8.27x5.91in Package Size: 27x25x18cm/10.63x9.84x7.09in Package Weight: 420g/14.82oz 1 x Helmet