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.
light weight tube - works great - very durable
This tubes by continental are top of the line. I have been using them for years without any issues. I would definitely recommended these tubes for MTB and road. Well constructed, nice valves.
I have put many miles on these tubes and I haven't had any issues with them. The removable valve core makes it easy to add stans keeping you wheels up for longer while on the trail.