Continental, one of the premier makers of race day tires has put out a series of lightweight tubes designed to keep your rolling weight down and puncture resistance up.
Bought this as an emergency tube for my trail rides. This saved me from walking my bike with flats on the trail. This tube is now installed on my front wheel and still holding up perfectly well. I will buy another one of this for my reserve.
High quality tubs with removable cores. The best tubes I have ever used and the only ones I use.
These are great tubes i'm sure, but don't lose riding days like I did. These tubes are 29ers, despite the description.