
Mount to Coast
H1
Versatile road-to-trail, but struggles on wet, technical downhills.

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Mate I am uncertain sorry, all I know is they fit me great and the toebox is perfect. Probably not the best for narrow feet...mine aren't excessively wide I'd say average and I don't use an insert.
Grabbed a Scarpa Ribelle GTX Trail running shoe for a bargain and it rocks!
Gravel is a tricky surface, I agree. It probably depends on the the percentage of a certain terrain in a run that I choose the shoes. Generally, for steep grass I like Mudtalons with 8mm lugs, for snow the Genesis and for barely runnable rocks Bushidos. But then again, there is always a trade-off, since a run is usually composed of different surfaces. As an allrounder in alpine environment, I often go for Dynafit, Prodigio or Ribelle Run. YMMY. (And yes: I might have too many shoes).
I too have gained appreciation for the Scarpa Ribbelle Run. Have tried most all the other usual contenders too, Ribelle Run is current fav.
I used Scarpa Ribelle Runs for easy scrambles (UIAA grade 3 iirc), any shoe designed for sky running will work decently well
I have been running in the Italian Alps for about ten years with distances even over 100km. I think that's enough to give you some advice. It really depends on where you live, the terrain you train on (mud, gravel, rocks, roots), the distance you like. To start, however, I recommend a comfortable shoe with a 4-6mm drop that is not excessively cushioned (you lose a lot of sensitivity on the ground) a sole with not too large notches (if there are some fast areas) Hoka Mafate Speed, New Balance Hierro, La Sportiva Akasha, Nnormal kjerag. Salomon sense ride (cheap and fast) Now I'm using the Scarpa Ribelle Run, they have 500km but they're not good

Mount to Coast
H1
Versatile road-to-trail, but struggles on wet, technical downhills.

Altra
Lone Peak Series
Spacious toe box, but cushioning and durability are polarizing.

La Sportiva
Prodigio Series
Great technical grip, but unstable for some, with sizing issues.

Nike
Pegasus Trail Series
Versatile for non-technical trails, but poor on wet, technical.

Mount to Coast
T1
Lightweight, cushioned; but lacing and underfoot protection are issues.

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Salomon - Speedcross Series

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Hoka - Speedgoat Series

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Mount to Coast - H1

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Salomon - Genesis Series

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La Sportiva - Prodigio Series

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La Sportiva - Prodigio Series