The closeup of the rear half shows how the stem cover helps to manage the cables in a very simple, effective way. There's also a large cavity inside the stem to house electronic control boxes for bikes with Shimano Di2 or Campagnolo EPS.
The Sigma stem is currently in development, and will soon be available at this link in the TriRig Store.
The TriRig Sigma is the first production stem built to provide superlative aerdynamics, elegant cable management, and integrated centerpull cable routing for aero brakes like our own Omega. This is TriRig's next production project, and it's going to significantly clean up the traditional front end to a degree previously achieved only in the realm of the so-called 'superbikes.'