These boots com in two last sizes, or widths, the LV fit has a 97 mm last while the standard fit has a 100mm last. This is designated as a sidecountry boot, and therefore has a walk mode. The action on the walk mode is very smooth and my favorite of the boots currently on the market. This boot claims to be a 130 flex, but when compared to other 130 boots, notably the Dalbello Lupo SP, they are softer. I would estimate that the are closer to the flex of the Salomon X-Max 120, or this years Seth Morrison Pro Full tilt. They have a heat moldable liner, but provide a much more comfortable out of the box fit because it is a blend of EVA and The more dense Intuition foam. They perform very well, given you want a slightly softer high performance boot. I would say the fit is somewhat similar to this years Atomic Hawx 90 in the standard last. Durability does not seem to be an issue (I have twelve days on mine so far) but as this is their first year, We won't know exactly how durable they are until later in this season.
These boots are amazing. What a fantastic introduction from K2 into the boot world... Makes up heavily for their mediocre ski lineup.
These are a kick ass boot for those who have multiple setups - say a dynafit setup, and an alpine setup - and want to use the same boot on all of them. They aren't a very light boot in comparison to the Pbax shell AT boots from other brands like Dynafit, Scott, and Scarpa, but they are fine for shorter ascents and more moderate angles.
these are based off of the Spyne series that K2 put out, so they have a carbon 'Spine' on the back of the cuff to increase torsional rigidity. They are a 3 buckle boot in the shape of a 4 buckle boot, and the 4th 'buckle' is a releasable powerstrap, with a buckle on it as well. This means these are super quick to put into walk-mode as all you have to do is unlock the top strap and the 2nd buckle (and put the 2nd buckle on the AT rung of the ladder)
The soles are made for din bindings, but have inserts for Dynafit bindings in the toe and heel, and therefore will work flawlessly with any tech bindings OR alpine DIN bindings. They are rubberized across the bottom of the boot and give grip when scrambling or riding a sled - or just walking across the parking lot..
The walk mode release is simple and consists of a metal lock that falls into place and connects the cuff to the bottom of the boot - just like on the Scarpa Freedom.
The liner is an intuition liner - though not the standard wrap version. These will not fit well out of the box, and must be cooked to your feet to fit well. There are 100mm and 97mm last versions of this boot, so it will work for just about anyone if they get the right one with the right last.
These boots are awesome for anyone who wants to do alpine or backcountry with the same boot.