RRP: 4.99 (per tube)
At a weight of 330g each, these are by no means light. However, increased thickness is intended to prevent pinch punctures, particularly in rock- or root-strewn courses. After riding these for over a month I can confirm there were no punctures. For the money-conscious among us, I found this was a great combination with cheaper tyres, as it seemed to compensate for thinner sidewalls.This may be complete luck, but courses where punctures have been pretty prevalent didn't have an effect on these tubes, even when I was fitting cheaper tyres. Therefore, it's easier to have a selection of tyres for various courses/conditions and use these tubes with them.
However, my one niggle is the apparent weakness near the valve. Out of five used tubes three of them ripped in this area. One was whilst running extremely low pressures, so is understandable. However, the other two I can't find a definitive reason for. My only guess is that the tubes do not cope well with lateral pressure (as I was hitting jumps and berms hard, sometimes sideways on). However, this is unacceptable for a tube which retails at nearly £5.
Therefore, the tubes are unreliable, yet seamless when working perfectly. They do the job of preventing punctures exceptionally well, it is only the valve which is a concern. Were I to have had a dodgy batch (entirely possible since the other tubes appear to be working perfectly on the same bike, with the same rider on the same courses) I could wholeheartedly recommend these.
