The R1 has sleek, modern styling and has an external size of a regular bicycle helmet. It weighs a bit more at 380 grams (13.4 ounces), but once rolling, the extra weight was not noticed. It ventilates as well as any midrange performance bicycle helmet, and it protects with CE and CSPC safety certifications. We found it to be sized slightly on the large side compared to other helmets. If you are between sizes, pick the smaller of the two.