A word about neoprene, there are at least 3 completely different materials called "neoprene" and probably why you get threads liek this that are complete opposites. 2 of the three types basically blow chunks for trails.
Type one is a waffle type weave with holes in it, sorta like a rubbery screen. Sorta like the Abetta air weeve, these don't hold up and grip to much oftne leading to sores and pulled hair.
The other is the smooth tube like material. These tend to get slicker than greased owl snot when wet and then either slide around, then either cause friction burn, or you over torque them.
The third kind, like used on the weaver and pro chilce is a flat marerial that looks like someone set it down on a really hot screen and kinda made little square ridges. These work very well for trail use, easy to clean, don't pic up burs like the felts and wools. Never seen a horse with issues with them but if they do, go with a mohair and slide glide in the armpits.