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We (Rossi) make a couple of differant ones, and market them through the racing line. I have one, and use it for all types of differant situations, Dirt Biking, DH Mountain BIking, Snowmobiling, and for skiing, when I want to do something stupid. I mostly just use it on big, deep days, when I might drop something and land on my back. Its a small investment to make for some spine protection.
I know a bunch of our guys use it in park skiing, and when you have it on you can barely tell its there.