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This is what they look like, I'm sure you have them as FedEx is a worldwide shipper. It's not 100% by any means, but much better than running nothing at all, plus it's very light compared to a thick liner.
I've purchased tires that have a kevlar lining, not sure if they make those for mtb tires.
tyvek.jpg

Thanks, yes have seen them, will have a look....

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