Cheese Grater Stirrup treads?

I was wondering how they might affect the stirrup leathers/saddle flaps and also boot soles. Thanks!
 
Mine run up so that they ont shred the stirrup leathers, and Id dont wiggle my feet around as they keep them still so havent noticed any probs with my soles.. can go investigate them for you?
I have a big popping horse so when my lower leg does an "ellen" i get to keep my stirrups!!!
 
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