This multi-sport helmet is specifically designed for various outdoor activities, incorporating advanced safety protection technology The high-strength ABS shell effectively resists impacts, while the EPS cushioning layer disperses impact force, providing dual protection for the head. The removable breathable inner liner is easy to clean and maintain hygiene, with 16 strategically placed ventilation holes ensuring optimal airflow to keep your head cool even during intense activities Precise sizing meets different age group requirements: S size designed for children with 48-52cm head circumference; M size suitable for youth with 51-56cm head circumference; L size for adults with 55cm+ head circumference. The rear dial adjustment system makes wearing more convenient - simply rotate for perfect fit Ideal for mountain biking, skiing, skating, rafting adventures and various other scenarios, making it the perfect choice for outdoor sports enthusiasts. Available in rich color options including classic black, vibrant light blue, passionate red, striking orange, pure white, elegant purple, fresh grass green, sweet pink, plus custom color service Lightweight design reduces neck strain, while the ergonomic streamlined appearance not only looks stylish but also minimizes wind resistance. Each helmet undergoes rigorous quality testing to ensure it provides reliable protection for you and your family