Girth sores?

Once galled they are then prone to getting them after any time off. I use a rubber inner tube as a girth sleeve on anything which galls. This was suggested by my pony club DC 40 years ago and they still work today.
 
Once galled they are then prone to getting them after any time off. I use a rubber inner tube as a girth sleeve on anything which galls. This was suggested by my pony club DC 40 years ago and they still work today.

Going to be stupid here, what's a rubber inner tube?
 
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