The secret to the award-winning fit is our Conda™ liner lacing system. Powered by a BOA® Fit System dial, this forgiving and adjustable harness is designed to pull the user's heel into the boot's heel pocket. This urethane-based harness hugs your ankle and flexes naturally. Externally, we started with an articulating cuff to reduce distortion when bending the knee, and we've integrated our Flex Zone calf panel at the top of the cuff, helping to keep legs happy all day long. A high-powered BOA® Fit System H4 Coiler closes the shell securely and can be done without removing your gloves. Lastly, to add durability and maintain the boot's flex over the boot's lifetime, we constructed the K2 Contour using our Endo™ technology.