1:08 AM

Polytex

Picture 908
I hardly ever see these around anywhere anymore.  These are polyurethane bicycle tubes.  They look more like medical equipment than bicycle equipment.  At about $13 bucks a pop you wont find many other tubes more expensive but they are claimed to be 3 times more resistant to thorns than typical butyl rubber tubes.  They aren't very elastic so make sure your tire and tube sizes match up.  The low elasticity also makes for quite the stiff tire once you inflate it to the correct pressure.