Petzl packs more features into the Altios than into any other helmet we tested. It has a similar construction to their popular Ellios but comes with an additional hybrid suspension system, Climate Control System and an ADAPT headlamp quick attach point. You actually have to scroll down the page on Petzl's website to cover all the features. The Altios has a different feel than other helmets because of a removable mesh layer that makes the helmet float above your head. This makes the helmet comfortable and breathable, but it also means that it rides very high, which affects both its look and feel.
This feature led almost all testers to find the Altios less desirable than the Petzl Elios. The real question is whether all the extra features are worth a price $24 more than the Elios and $30 more than most other hard-shelled helmets. Try it on. If you don't mind the fact that it sits so high, this might be the helmet for you. Otherwise, we would either spend a little more money to get the Petzl Meteor or look at one of the many highly rated helmets for $60 to $65.