I always did on the motorcycle, but I guess I'm not expecting bicycle accidents to be as bad. Speeds are far lower, so road rash would be far less severe, and so would duration of exposure to it. I can see the point as padding, but haven't needed it for the length of my ride.
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."