Each snowboard boot feels different based on the fit, softness/stiffness profile, and the materials used to create the interior liner and the exterior shell. Some ingredients degrade and soften faster with use, while others are more rigid and durable. Typically, higher-end materials reflect a bigger price tag.
Many snowboard boots have heat-moldable liners that are removable. Heat-moldable liners will eventually conform to your feet if you simply ride in them. To speed up the process for immediate comfort, take your boots to a snowboard shop to get the liners molded.
A retail specialist sticks the liners onto a special heater that warms the components and then puts the footbeds back inside. With the materials all toasty, you stand in the liner for up to 15 minutes to cast the shape of your foot.
You can also pull on your boots and snowboard socks at home to help with the break-in process.