Lazer Tardiz2 bicycle helmet The Tardiz2 bicycle helmet is the modern interpretation of the classic triathlon helmet and can be described as a cross between a TT and road helmet. The helmet is designed with the same principles as the original triathlon helmets: aerodynamics and ventilation. The helmet has Dual Layer Aerodynamics. The shape of the helmet and the small frontal surface ensure an optimal aerodynamic shape. The special calves in the back also help to retain air bubbles and thus improve the airflow over and around the helmet. Comfort has not been compromised either. The helmet is equipped with an ATS Fit System for easy adjustment of the fit. The helmet also has a TS Turnfit System and an In-Mold construction, which ensure safety and comfort. The Aquavent provides direct cooling and an open front that is suitable for glasses wearers. With a water bottle you can also easily spray water through the Aquavent. This allows you to spray the water directly onto your head for direct cooling, perfect for hot days! A real must-have if you are planning to do a triathlon! Specifications: Color: matte black Gender: unisex Material: EVA Certification: CE - CPSC - AS Dimensions: 23.5 x 41 x 22.3 cm (L x W x H) Weight: 372 grams Head circumference: from 55 to 59 cm Size: M