This article is from the Australia Motorcycles FAQ, by Cameron Simpson cs@zip.com.au with numerous contributions by others.
From Tom Cohen <thos@cia.com.au>.
Padding is common amongst the touring-style jackets, but it
may not be much use in the case of a crash. Most of the
padding built into these jackets is low-density foam rubber,
like the stuff you might find in a mattress. This foam
compresses very easily and absorbs very little of the impact
of a crash. Foam padding can work, but it must be high-
density to be of use. A double layer of leather is of more
use than low-density foam.
Good impact resistance in jackets and boots is provided
either by hard armour or closed-cell/high density foam. Some
people have said that the edge of hard armour can cut in an
accident if forced into the body.
 
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