From the Manufacturer:
The 29er watch models got their name from a small sailing dinghy used by young sailing talents in their Junior Championship Class competitions run by the German Sailing Association (DSV). This little regatta skiff is not only able to speed through the seas but also very easy to sail in all kinds of waters. Additional draft is only provided by the stabilising centreboard in the hull, which requires water to be sufficiently deep. In the case of the dinghy’s wristwatch counterpart, we now have significantly reduced the depth of the 29er: with a height of just 9.35 millimetres and a diameter of 42.4 millimetres, the stainless-steel case of the 29er Casual is the flattest case in the current Mühle collection.