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I see restrap do a set for 10 quid but I so rarely need these I'm not sure I need so many.
https://restrap.com/products/tyre-boot-kit
That actually looks like a better idea than the other stuff, at least, for a more permanent fix than the Park ones. Maybe I'll get one of these and add it to my "offroad" kit.
I like these because they stick on, but they're not durable so no good for permanent fix.
https://www.parktool.com/en-us/product/emergency-tire-boot-tb-2
Patch or a tyre boot