My size medium Trenta fits my head (58cm circumference) almost perfectly--not tight, but not so loose I need to ratchet the retention system fully to keep it in place. Ive worn the Trenta on several rides in temps ranging from low 80s to mid 90s, and ventilation is fine. The helmet weighs 297g on my scale, which is on par with other premium MIPS or MIPS-like helmets I own...A couple of minor issues prevent this from being a great helmet: 1) The front retention straps are anchored relatively far back, to the point where they overlap my earlobes. I was able to adjust them a so they barely clear my ears, but I've never had to do this with any other helmet and it took a lot of fiddling around to fix this. 2) The back of the helmet interferes with some of my sunglass arms--POCs bump up against the helmet, but my S-Phyre glasses fit with no contact.
I had been using an older Bell Helmet and thought I was covered. It was a bit heavy, and "sat" on my head rather than cradle it. I read about newer Kineticore technology and went to the MIT lab helmet ratings. This was one of several that offered what science and engineering said would be better protection. I've only got one head, and being older I fall a bit. This fits my head and doesn't "sit on" my head, the strap keeps it snug. I believe I have a better chance of suffering less injury to my head if I take a spill with this on.
Stays put once installed. I don't detach it to charge it. I assume if you always take it off the helmet to charge it the clips will get worn out. It's a great addition a bike mounted tail light. It's bright enough to grab the attention of others.
Went with the ventilated helmet this time around instead of an aero hot box, and this thing is super airy. Somehow though, they managed to do it and it's not loud, some of these things are nuts when you're riding, but this one seems to be reasonable.
Fit is subjective, these seems to be more oval than round. My old POC road helmet did fit me better, but this one isn't bad, just different. The dial is super easy to turn too for adjustments on the fly, sometimes these things are super stiff and annoying to work with.
Sunglass dock does actually work too, very appreciated.
No real issues, nice and light, and who cares about aero when it's 100 degrees in blazing sun.
My only sorta annoyance is with all of the vents, you'd think you can itch your head, but nope, I can't get my finger in any of the vents. I miss that relieving joy while riding. You can work around it though.
