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Buy the good boots. not the cheap ones , the more expensive ones tend to be put together better and offer more side protection especially for the ankle.
I had a pair of mid level oneil boots they were roughly $139 but as I found out the hard way they didn'y have much padding in the ankle and the plastic side plate only went 1/2 way up the boot on the outside so the seem seperated.
I was riding last weekend in wrentham and tooling along a big rock pulled my foot off the peg and slammed it into the passenger peg on my Drz ( which by the way I am removing to prevent this from happening again)
It tore a 1/4 " size hole on the leather and made my foot go numb. I kept riding as it started to feel better, until about 1/2 hour later it happened a second time only seperating the boot at the seem. A few advil and I was able to keep riding. But man did that hurt.