In reply to LastBoyScout: Depends on how the puncture was formed. I had one that formed a puncture on a crease mark, and they were happy to replace it for me. I've got another one that's done the same, so I should get round to sending that back. I'm happy to pay if they think it's not covered, but I'd prefer them to be the judge of that, rater than me trying to second guess their policy.