rubber nail on shoes

I noticed a set of rubber shoes in a farrier's truck recently and was interested. Has anyone used them? If so would like some feedback on wear and traction and the sort. Any help would be appreciated.
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We used them on carriage horses when I was driving tourists in Colorado. They are nice for cushioning and traction on pavement, but they don't last long. I think some police mounted units also use them.

That's what I suspected as well. I use old school borium on steel for asphalt but was intrigued by the rubber if they would last they would be a great idea
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That's what the Canadian Mounties use.

My biggest problem with those rubber covered shoes..and the plastic types too, is that they can't be shaped to the hoof without compromising the integrity of the shoes themselves. And, every time a horse is shod, they need to have the shoes shaped to their individual hooves. Failing to do that can cause some serious foot problems.