Hi Billy,
Not really sure what you mean by side slopes mate.
Do you mean something like a rock that is angled that you have to traverse?
If the ground you are walking on is angled sideways then it's tricky no mattter what shoes you are wearing.
There is a beach we visit where there is a 50m section that's traversing a rock, i've done that section in sandles, trainers and many times barefoot, it's tricky no matter what you are wearing.
Thinking about it the second worst (after flip flops) is doing the section barefoot, as my skin tends to slide about over my foot bones, very unstable.
Am i right in thinking that people believe because the sole is thicker it will give them the feeling of being less stable?
If so i did a test the other day.
I got a chair and placed one of the legs inside my HOO, i then measured how high the other leg was from the floor.
Un-weighted i saw 35mm which is pretty much what HOO give as their heel height.
With 20kg on the above the chairs leg (the one that went inside the shoe) i saw 30mm.
I'm around 90kg, add another 2kg for water and my running bumbag and i wouldn't be surprised if i saw 25mm or even 20mm heel height, this just when standing.
Now think how much force is applied when we're running.
Doesn't end there though, out of curiosity i used the same system to measure the heel height of some Salomon hiking boots i have
Un-weighted 35mm
Weighted 34mm
Salomon XA3D Ultra 2's
31mm un-weighted
28mm weighted
Here is the surprising one though, i measure my Salomon SC3's
35mm un-weighted
32mm weighted
There is no right or wrong answer or opinion here, if someone finds a footwear solution that works for them and the type or running/hiking they do then that's the right choice for them.
I do think that often our brains can trick us though, we'll see a shoe with what we perceive is a thicker sole, but in reality with our weight on the shoe most of us have hiked with our feet higher off the trail for years without worrying about stability.
Lastly,
The sole at the heel and of the foot of my Mafate speeds is exactly 1cm wider than the heel of my SC3's.
So we have a shoe that's wider, softer (so forms to the terrain) and with weight actually lower than my SC3's
Obviously my chair method of measuring isn't exact, but hopefully you'll still find it surprising that this supposedly unstable shoe is in fact lower than most my other trail runners and hiking boots when i'm weighting it up.
Cheers
Mark