Before buying I've only read through some reviews and other customer reviews. My decision was made then to the ABUS bicycle helmet, also because I was known as ABUS brand. There are 2 different sizes of the helmet, so I just took a tape / cord and wrapped it around my head again. Front fixed to the forehead with a finger and then tightly over his ears once rum, up front again at the end. The length of the thread, I then measured it with a tape measure, this length, I then also used for ordering. Fits perfectly! The delivery was prompt, the package was neat and there was also a leaflet in. The helmet is really really good and can be mechanically varied over the "knob" in size, thus you can do brisk or loosely also to taste the fit of the helmet. A special feature of the knob on the back of the helmet has (mind) LEDs integrated, they can pressure the finger simply switched on and off. Additionally, there is a flash algorithm ..., definitely a security feature if you drive a lot of the evening in the dark or dusk. The helmet has let up a plurality of slots, the circulation of the air, so that it is on the warmer days not so hot under the "hood". The wind is so cool to be able. In front, between the slot openings to protect integrated flyscreen, makes perfect sense. I can recommend to the helmet an additional rain cover, so as an overcoat for the helmet. I bought specifically for the worse days, but possibly makes for more sensitive people also sense when the weather is nice. Who owns the wind as Kühlungsluftzug through the slots on top of the helmet uncomfortable strikes (with me not), which can interact with the overcoat against. Can definitely issue a strong buy recommendation.