Sounds to me like you have a really bad problem
that is with something besides your saddlepad - maybe your saddle doesn't
fit or your horse is really unbalanced! I say that because I had
the same problem several years ago using a pad very similar to a Skito.
It would scoot off to the right so bad I had to tie it to the saddle to
keep it on. It turned out that my horse had/has low heel/high heel
syndrome and was travelling really crooked. When my farrier, working
with Kerry Ridgway, corrected the hoof imbalance and I worked on strengthening
the appropriate muscles and changing my horse's mindset, his body straightened
out and the pad stopped slipping!
Because his crookedness is built-in I'll always
have to continue exercises to help Dudley keep as straight as possible
- as well as have him shod by an expert farrier! But I can tell you,
he is a much happier horse now than he was before we started all this -
and so am I!!
BTW, I do have a Skito pad with the wool backing
which I am extremely satisfied with. I wash the pad at least once
a week and the wool fluffs right up. (I never use any detergent or
soap, just warm water and I do not put it in the dryer.)
I hope you can get some help figuring out what is
making your pad slip so badly!
PS As shimming, you could experiment using a hand towel.
Try putting it right under the middle of the saddle on top of the saddlepad
( where you sit) because your saddle may be bridging - touching at the
front and back but not in the middle. Also try more thickness on
the side the pad slips towards.
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