I wouldn't be surprised if most of his butt was gone too.This could be posted in the Military BS stories instead of here in the Motorcycle Safety Thread.
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He landed square on his butt and slid for a great distance, until he got down to about 10 or 15 MPH, then he started tumbling until he stopped. Of course they were not wearing helmets, just biker boots, heavy jeans and leather vests.
When they got to the guy he was in pain. His head was unhurt. The seat of his jeans and most of the skin on his butt were gone.
There are actually wear ratings for various materials, blue jeans are probably the worst.
Heavy leather will wear through in 6 seconds.
Denim blue jeans wear through instantly upon the initiation of a skid, literally shred in less than 1/2 second.
Most good riding pants will have a 6 second wear rating and most of those have some sort of Kevlar, Covex or similar liner or threads woven into the outer fabric. Occasionally you see riding pants with no rating (5-11 brand offers those and I don't even know how/why they are riding pants), some budget pants are rated for about 4 seconds. To save $$ you can buy some pants without armor and, if you have 1 set of removable armor just move the armor pads to the pants you plan to use.
Honestly if you figure that you are likely to roll and tumble in addition to sliding, seems like 4 seconds might actually be pretty good?
We have stuff rated at 6+ seconds and some of our riding pants/jeans/cargos were under $100. That seems like pretty cheap protection from road rash (or worse).