re: Salomon X Ultra 3 Mid Aero . . .
I have been wearing a pair this year for deserts hikes. Mostly to protect my ankle area from desert cactus spines and other pointy stuff.
Over the past 12 years I have worn out several pairs of Salomon XA Pro 3D trail runners, which have been the best overall shoe I have used during that time. So in comparison —
The Ultra 3 Mids are more breathable than the XA Pro 3D, which is actually a bit of a problem. I get so much fine dust through the mesh material I have started wearing silk liner socks under my wool socks. Actually, GTX shoes keep fine dust out, but are warmer to wear, based on the one pair of GTX shoes I have owned.
For a mid “boot” they are pretty light.
I think the XA Pro 3D might have a stiffer sole. At least they seem to me to be.
Traction is good on most kinds of terrain.
So far I like them. How long they will last is still an unknown. Hopefully at least as long as my XA Pro 3D last. Both shoes look somewhat similar in design. The Ultra 3 Mid is certainly not close to being a “mountaineering” boot.