Lighter, more compact, and more durable. Yes, all three properties in one. WTB represents the soul of NanoAir TPU (thermoplastic polyurethane). It is compact and packs down to one-third the size of a traditional inner tube. Just imagine how many more things you can fit into your backpack – like a drink, a snack, or even a snack for a friend who always forgets theirs (yes, that's exactly who we mean). It is light. Really light. 60% lighter than the "heavy" soul you keep carrying around. "But if it's so light," you ask yourself, "is it really better than my old soul?""Don't worry, these TPU inner tubes are extremely durable. Thanks to the special construction and layering of the material, they are stronger than traditional butyl tubes. What if you have "that day" and go through thorns, so you're facing another flat tire? No worries, we've included some TPU patches so you can keep going. Specifications Valve: Presta 85 mm Weight: 55g The package includes 2 TPU patches Video