HJC ATARA Cycling JCF Breathable and for Road Bikes Size M Helmet, Certified, Lightweight, (MT.GL OLIVE, (55-59cm))

This model utilizes the technology developed for high-end models to achieve both excellent aerodynamic performance and comfort, making it ideal for everyday use. Like other models, the inner pads are removable so they can be kept clean at all times. A wide variety of colors are available, from classic to cool! Feather Light: HJC bicycle helmets are engineered with precision to maximize weight savings. Density, placement, shape, and materials all contribute to weight optimization. [Wind Tunnel Tested] HJC helmets are tested in both laboratory and real-world riding conditions to meet the highest quality standards. HJC is one of the very few helmet manufacturers with its own state-of-the-art wind tunnel to test aerodynamics, ventilation, noise, and more. The HJC wind tunnel measures the forces of air under various riding conditions to improve helmet performance. Venturi Dynamics: To achieve maximum ventilation, HJC's aerodynamic models feature technological improvements that utilize Bernoulli's principle. In motion, the speed of the surface flow typically increases as you move towards the rear of the helmet. Utilizing the pressure difference, cool air drawn in from the front intakes dissipates the internal heat through the rear vents, allowing cyclists to enjoy optimal ventilation and perfect airflow while riding. In-Mold Construction: In-mold construction is a method of combining EPS (Expanded Polystyrene) with an outer polycarbonate shell, resulting in a stronger structure that offers improved rider protection, compact reinforcement and a flawless finish to the product. Advanced Air Channel: A constant volume of air passes through the front air intake ports, circulates throughout the helmet, and is finally expelled through the exhaust ports. This internal airflow helps cool the head and expel heat. Weight: 210g (Scientific IOg) / JCF official approval This model utilizes the technology developed for high-end models to achieve both excellent aerodynamic performance and comfort, making it ideal for everyday use. Like other models, the inner pads are removable so they can be kept clean at all times. A wide variety of colors are available, from classic to cool!