I'm using tyres with kevlar bead which is supposed to prevent puncture. I have only started using them 2 weeks ago along with new presta tubes and didnt bring spares thinking the kevlar would stop these sort of small punctures. I was thinking of catching the train, but as I was a few hundred metres away from the train station the train arrived and departed. They were doing maintenance at the next stop and were using buses from their until my destination, but buses dont allow bikes on board. Luck the ticket machine was busted or I would have blown my money. So I had to walk 8-9km home.

The tube had a small hole but I couldn't find any penetration mark on the tyre tread after thoroughly examining it with a magnified glass for over 30 minutes. So I dont know how the puncture happened.

Is there any inner tube lining that can be used as an additional barrier between the tyre and the tube?