Two systems for ski touring bindings have been on the market for many years: the frame binding system and the pin binding system. They differ fundamentally in the way the boots sit in the binding and have specific advantages and disadvantages. Like alpine bindings, frame bindings are fixed to the edge of the ski boot with front and rear jaws. To get on, the entire binding is lifted by means of its "frame" together with the boot with every step. With the pin system, the ski boot is fixed to the toe piece (and usually also to the back piece) using special inserts and two "metal pins" in the binding - hence the name. To get on, the rear jaw is turned, folded or pushed away - the boot is therefore only fixed at the front. This means that the entire binding does not have to be lifted with every step, which saves a lot of energy.
Until a few years ago, Dynafit was at the forefront of the pin binding market thanks to its patent. This not only resulted in a limited selection of ski touring bindings, but also limited the boot models with matching inserts. Since the patent expired in 2012, however, the range has multiplied. Not only do numerous manufacturers offer different types of bindings, but boot models are now so diverse that every ski tourer should be able to find a suitable boot!
Advantages and disadvantages of frame bindings
When I started ski touring at the beginning of the millennium, the frame binding (or the Fritschi Diamir) was the measure of all things. Especially if you wanted to ski downhill, there were simply no stable boots with inserts for pin bindings. And although all the innovations in recent years have actually taken place in pin bindings, frame bindings are not yet obsolete. Despite the design-related weight disadvantage (and the fact that some extra weight has to be moved with every step), they do offer some undeniable advantages. For one thing, almost any ski boot can be used in frame bindings. Secondly, they have an adjustable safety release that is comparable to that of an alpine binding. The operation of frame bindings, such as getting in and out, changing the climbing aid and switching between walking and skiing mode, is usually quite simple. There are also some models that are ideally suited for very heavy and aggressive skiers thanks to a maximum Z-value of 16.