I rode all day in Spain in July in mine for a week a couple of years ago and used it as my only MTB helmet most of that year.
If anything it’s over vented for cold weather (add buff) but not a problem in the summer. I didn’t find it affected my breathing, camelback works with it but eating can be problematic and shape/size of item dependent. You could eat a gel with it on no bother.
I subjected mine to some serious crash testing before deciding it was written off after I scraped myself off the bike with an unseen low tree to the head at speed. The guides were surprised it was even still the same shape after that particular crash.
I’ve replaced it with another. No hesitation recommending this helmet, particularly as you can’t unluckily have the chinbar removed when it would have been useful.