Burton Swath boa snowboard boots are great all mountain boots with a medium stiff flex.
These boots feature the dual Zone Boa - Not only does it make it easy to wrap the boots perfectly to your foot with the Boa dial wheels. Also, it makes a much more precise wrap due to the dual zone system. It means that instead of one channel for the wires to run through these boots have two separate channels for each Boa dial wheel wire. This way the wrap is much more precise and tight. Therefore control, feel and power-transfer is enhanced.
The Imprint 3 liners feature a lot of great solutions that will ensure good fit, optimized power-transfer, and nice comfort. They feature a breathable technology utilizes thermally activated carbon that is woven into the liner - Burton name this technology Dryride Heat Cycle Lining. It radiates and reflects body heat to keep your feet warmer but at the same time allows moisture to escape.
The Focus Cuff is implemented to optimize comfort and control. They ensure that your feet are wrapped well, that the heel-hold is good and your calfs are supported by neoprene stretch zones.
To finish up these all mountain and backcountry snowboard boots with a medium flex (Response: 5) you also get comfort through the Molded EVA footbed and Vibram outsoles with great rebound and cushioning.