The HJC Adwatt Time Trial Helmet is designed with high density techniques based on the experience of HJC motorcycle helmets.Features:- Use: Triathlon- Reinforced internal structure: Embedded within the EPS, the skeletal frame has been designed to bind the structure of the helmet together while at possible impact. - Advanced air channel system: The air channel inside the helmet has been designed for maximum flow. Depending on the riders speed, certain amount of air will travel inside the helmet by the frontal intake vent and through the inner air passage and out to exhaust vent. Optimal circulation of the air through the air channel helps to cool the head while in heated riding condition.- In-Mold construction: EPS is bonded to the outer polycarbonate shell to have more conformed strength in structure while providing a clean finish to the product.- Polygiene: All helmets are integrated with special particles of Polygiene Silver Salt (silver chloride).