A well-built medium flex boot that fits like a glove around the ankle area with some extra room in the toes.
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A neutral fitting medium flex boot.
Push your boarding to new levels with the K2 Boundary boot. A mid-flexing boot complete with dependable features like a cozy Intuition liner, 3-Point Harness for support and heel retention, and double Boa Fit System to micromanage your fit, the Boundary has everything you need to keep you exploring all season long. The medium stiffness and articulated cuff work in unison to provide an even and consistent flex so the boots are able to transfer your movements into the board effectively. These have all the stiffness you need to cover the whole mountain, they aren't so rigid that flexing into them takes extra work but they still feel plenty supportive.
If you want a more responsive boot with a similar fit, check out the K2 Maysis. Aside from the slight difference in stiffness, the boots have different lacing systems. They are both double Boa, but The K2 Boundary frontal Boa laces around the calf/shin, and the side Boa laces around the lower foot. The Maysis has the Conda lacing system, which means the frontal Boa handles all the exterior lacing, while the side Boa handles the Conda system on the inside.
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A solid option for someone looking at double BOA snowboard boots in the medium flex range.