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AUS4 said...
Thats right, that is the only reason they wear a waist.
I disagree.
Most of the PWA Slalom races are held in hell windy places that are super-rough. In those conditions, and in Maui where a lot of them train, the advantage of the waist harness is that it gives a much greater range of movement in the lower half of the body and hence better ability to absorb bumps.
It's all about staying in control.