Not in that Paris-Hilton-psuedo-slang sort of way, but literally, this thing does not breathe as well as some other options out there. It definitely makes it preferable in the winter, but it can get uncomfortable when rock climbing in the summer. On the other hand, this is one of the lowest profile helmets out there, which is great. A lot less clunking under a low roof with the Salamander, something I've run into with other, higher profile (and therefore better breathing) helmets. It has a lot in common with skiing helmets, not the least of which is the padding on the chinstrap. I get the impression that since Grivel is mostly an ice climbing and mountaineering company, that was deliberate. The headlamp clips are also kind of lousy in back too. If they switched to the squared off hook thingies that are used in front, it would work a lot better. In addition, the little notches that the bungee goes through don't really keep the bungee in place. The current system is not really compatible with 3-strap headlamp designs (e.g. Petzl Myo XP). As it stands, I have to disconnect the top strap of my headlamp and reattach through the bungee loops. Makes it super secure, but takes a lot more time to adjust.