I’ve been riding mountain bikes for 35 years and this is by far the best fitting and ventilated helmet I’ve ever owned, including those that retail for twice the price from Giro, Specialized, Fox, and Kali. I like it so much, I bought a second one to store away until the first one wears out.
I have a large head, but most L-X-LARGE helmets are too big/bulky requiring me to max out the ratchet adjustment. This Protera only requires a couple clicks before it snugs up.
The adjustment mechanism does appear to be more fragile than other designs, so I picked up a couple of replacements just in case something breaks. I do like that they are easily replaced.
One thing that could be improved on is the matte coating, which is easily scratched, revealing glossy plastic underneath. Seems like just rolling with a gloss finish would have been more durable.
5 stars for fit, ventilation, visor, and shell design (it doesn’t look goofy like most X-LARGE sized helmets) .