Many, many years ago I had a motorcycle (British 1958 Matchless).
I bought the best helmet that I could afford …… because I only had one very small brain.
I already have 3 perfectly good helmets (Petzl Vertex, Pacific brimmed, etc).
I bought a Protos, because it appears to have several areas of increased protection; specifically the sides, back, and the top.
The sides & back have increased coverage.
The top suspension does not have the normal strap webbing. It has a high tech “honey comb” (well ventilated) & foam top suspension.
The helmet is very comfortable & has an extremely secure feeling. It has LOTS of adjustments.
I have a small head (7-1/8 hat Sz), and this hat has no problems fitting.
(I have to add "spacers" to the head band of my Petzl Vertex.)
After fixing the initial headband diameter, the simple “flip-down” clamp in the back secures the helmet below the ball on the back of the head ……… very secure feeling !
The integral ear muffs are terrific ! They fold back into the helmet (very compact !), but also seem to add side protection.
The sound reduction is great. The compression adjustment is very easy !
I will still wear ear plugs, but because the muffs are there, I will use them !
I have both of the mesh visor options (coarse & fine).
The Protos website states:
16 “notches”/cm2 and 39 “notches”/cm2
Visually they don’t seem all that different.
However, contrary to the intended design, the fine mesh seems to have less of a "distraction" quality. Just IMO.
Because they are just mesh, I will also always wear glasses w/ side shields (as recommended by Pfanner).