K2 had an advantage when they built their first hike-mode (HM) boot: they hadn’t made any boots, so they could build the HM model from the ground up. Since making a killer BC boot was central to their line from the outset, they built an alpine boot technology, Energy InterlockTM, which was easily adaptable to hiking. This is why Synchro InterlockTM, K2’s HM mechanism, has first-in-class rear support without losing the needed range of motion to make hiking feasible.
K2 also concocted a replaceable walking sole that will work with any binding from everyday alpine to high-tech Dynafit, and they offer it all with a narrow (97mm) or medium (100mm) PrecisionFit Tour Intuition® liner in the top-of-series 130. The Pinnacle 110 comes in either medium (100mm) or wide (102), and the Pinnacle 100 gives big feet a chance to live the sidecountry lifestyle with a wide-ass 102 last.
New to the Pinnacle clan in 2017 is a full-on AT model, the Pinnacle Pro. Made in Pebax (as is much of this genre), with a 130 flex and 100mm (medium) last, it uses its own PrecisionFit Tour Light Intuition® liner. The Pro comes with a DIN-compatible sole with molded-in Tech inserts; a Vibram® rockered ISO 9523 touring sole with extra traction is available as an aftermarket replacement.