The thing that all Alpine ski touring bindings have in common is that they will have a function which allows you to unclip the heel part of the binding allowing your foot to hinge forward at the toe. This makes it possible to take strides forward and with the use of ski skins means that you can make good progress up hill. You will also then be able to lock your boot heel down to ski alpine style for the descent.
This is achieved in different ways by different binding manufacturers:
Tech or Pin Bindings (Dynafit style) use a frameless system which requires special tech inserts in your touring boot. These bindings have a seperate toe and heel piece mounted to the ski which 'clip' into the tech inserts on your boots. The heel section can be rotated to prevent it from clipping to your boot leaving your boot pivoting at the toe. These make for a very lightweight binding system which is great for touring.
Frame bindings (Fritschi type) have a bar or frame that attaches to the toe and heel of your boot. To use the touring function of these bindings you unclip the back of the binding and the whole frame lifts at the heel and pivots at the toe. These bindings are heavier but have features like adjustable sideways toe relaese which can make them safer. They are also, in general, more robust and better at edge to edge power transfer making them a better choice for more all round use (ie: some piste skiing etc). Bindings like the Salomon Gaurdian 16 BC and the Marker Duke etc are also frame bindings.
We have lots more to say on this subject and more will be added to this article soon but if you wish to know more in the mean time please get in touch.
Backcountry UK Tel: 01943 816011 email: email@example.com