Park Tool Emergency Tire Boot TB-2
The fastest, easiest, and most secure way to repair a cut or worn tire sidewall. The TB-2 is produced using a strong, waterproof vinyl membrane with fiber weave reinforcement. A super strong pressure sensitive adhesive assures the boot stays in place in any tubed tire, road or mountain, high or low pressure. A true ride saver.
Great product, many uses and fits in seat bag. Got me home (20 miles) after a nasty cut to sidewall of tire. Put these in your kit and you won't be sorry.
Product has saved me once and a buddy once. Works in an emergency of side wall tear (not too large), with tube. Had to compliment with Power bar wrapper on larger tear (ran less air pressure but was not stranded or had to walk it out). Won't work on tubeless with Stan's (patch won't stick).