Tyrolia has more than 80 years of experience in building bombproof bindings, and over the past few years it's begun to set its sights on the backcountry. The Adrenalin 16 Alpine Touring Binding allows you to access those top secret powder stashes just like many other AT bindings, but with a more alpine focused, full frame design, it delivers the same solid performance you'd expect from a more traditional Tyrolia alpine binding. The heel and toe pieces are borrowed from their strong, reliable FR Pro series and both rest on the FR Pro frame and FreeFlex mounting platform. A quick flip of the Ascender lock switches between ski and tour modes, without requiring you to disengage your boot from the binding. In ski mode, the FreeFlex platform allows the FR Pro Frame to float atop the ski without inhibiting ski flex. Alone, this feature is a gift from the gods for many big mountain skiers who want the benefits of an AT platform, but wants to feel every inch of ski flex. Once back in tour mode, the Adrenalin pivots forward at the toe and utilizes a three position climbing aid to help you effortlessly crush even the steepest of grades.Wrought with an alpine heritage, this is a 16 DIN AT binding that delivers responsiveness, efficiency, and security both on the way up the hill and on the way down. Purchase the short Adrenalin if you have a boot sole length of between 270 and 330mm, and purchase the long Adrenalin if your boot sole length measures between 300 360mm.