Take a photograph of it, as a fail safe.
You can try spray lacquer it, but it might make the signature run, depending on which pen it was written with. You could also glue a piece of book covering plastic on it, but that would not handle rain or puddles.
Best option, I reckon, would be water-based boat lacquer. That is fit for outerior use and water-based would not make the pen run. Although it is always best if you can pre test if the pen used will run (if you own the same pen still)
You can always stop using the shoes and put them on a shelf.
Rubber is an insulator, so lightning cannot effect rubber shoes.
Because Science!
golf shoes have rubber soles because it is a game played on the grass which needs to have stops at every step as rubber will increase the interlocking of friction, golf shoes have rubber soles
Runnign shoes have flexible rubber soles to absorb impact.
There are a few reasons for the practice of wearing rubber shoes while working in a hospital. Rubber shoes are very comfortable and are washed easily in case blood is spilled on them.
rubber
Rubber Shoes - 1988 TV was released on: USA: 1988
The rubber ball, eraser, tyre, shoes, rubber hoses .
Rubber stamps incorporating a signature can be purchased from stores that sell custom rubber stamps. US-based stores offering this service include: theStampMaker, Staples, Holmes Stamp & Sign and Simon's Stamps. Stores in the UK offering signature rubber stamps include Vistaprint, Stamp Design 4U and London Rubber Stamps.
Shoes were and are made of leather. You can also get plastic or rubber shoes.
The Bewitched Rubber Shoes - 1913 was released on: USA: 12 April 1913
Rubber soles prevent the player from slipping while playing basketball.