‘unpuncturable’ inner tube
 

Tubolito has released a thermoplastic polyurethane (TPU) inner tube called the X_Tubo City/Tour that comes with a one year warranty against flats. If it punctures within that period you get a free replacement.

They must have a limit.

https://road.cc/content/tech-news/tu...er-tube-284077

I'm wondering about rolling resistance, too. That said, they're only making these for 30-50mm tires, so maybe they're not aimed at the performance road segment for a reason.

The Schwalbe Aerothan tubes are made with the same material as the Tubolitos. Don't think they have a no-flat warranty. They supposedly have rolling resistance similar to latex tubes but with better puncture protection. Have had mine for 3 weeks. No flats so far.