Here is some inform on the construction:
The top bars are made out of spring steel encased with plastic to dampen vibration. The cup shaped like that ('D' shape) to create a better sealing and it is made with protein leather (flux leather), the strap is made out of material similar to rucksack type airy material to keep the head cool and the strap height is user adjustable. I found it quite comfortable and light. The cable is not balanced. Warranty is 2 years.
Edited by SleepyOne - 10/10/13 at 1:46pm