The Giro Ionos helmet is one of the best MTB/road helmets, but it has only one downside, its price! Being one of the top range helmets offered by Giro, the Ionos features all that you wish from a helmet, secure, lightweight (around 300g), adjustable, comfortable and extremely good locking.
I will skip the specs part as you can find them anywhere (just Google it) and go straight on how the helmet feels and performs in real life. Now you are probably asking what is this road looking helmet doing here, but the answer is simple, although it is not listed as MTB helmet anywhere on Giro’s website, these kind of helmets are becoming more and more popular among XC racers.
I have been using the helmet for a while now switching between my Giro Xar and the Ionos depending on the color range of my outfit. I do a lot of cross country rides with a lot of climbs and I live in an area where in summer temperatures go often above 40°C. The advantage this helmet has over the Xar is better ventilation, and I must say sometimes you just forget that you even have a helmet on your head. It is so light and airy.
As for the padding the two anti-bacterial sets of pads that were included in the box are great. The only thing is that if you are not careful you might loose some of the smaller pads, but on the other hand you have two full sets included in the box. The X-Static helmet pads include anti-microbial silver fibers which not only reduce the bad odors, but prevent skin irritation if you somehow forget to wash them for a few months.
Another surprise was the winter padding included in the box. The thicker pads with a dense net is meant to be used on colder days. I do not think that it helps a lot it is extremely comfortable to wear. If you plan on doing some real winter cycling, get a windproof helmet cap.
The bottom line is that the Giro Ionos is a hell of a helmet with excellent ventilation, very lightweight, packed with features, meets the requirements of the the European safety standard CE EN1078 and great design. I was not able to find any cons, except the price tag, but it is well worth the money.
Update: Wearing this helmet somehow reminds me of the Super Mario Mushrooms. Just kidding.