The only tube I have ever had that would give me any "Protection" against Thorns was a Thick Latex tube. The thorn would still penetrate the tube but the latex would semi-seal around the thorn. The puncture was still there and would give me a slow puncture- but pump it up and it would last till I got home. Or I would get home without realising I had a puncture and it would go down a couple of hours later.