It starts with a heat-moldable liner made of open-cell Intuition® foam - allowing the liner to form to the exact shape of your leg, ankle, and foot for superior fit, warmth, and comfort. The secret to the award winning fit is the Conda™ liner lacing system. Powered by a BOA® Fit System dial, this forgiving and adjustable harness is designed to pull the users heel into the heel pocket of the boot. This urethane-based harness hugs your ankle and flexes naturally. Externally, K2 started with an articulating cuff to reduce distortion when flexing the knee, and they've added an abrasion-resistant rubber compound for unrelenting durability. 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 flex of the boot over the lifetime of the boot, K2 constructed the Maysis using their Endo™ technology. Underfoot, is premium materials to improve damping and grip. The outsole is built using K2's proprietary This Grips!™ dual-rubber compound to provide excellent grip both on and off the snow. This is all set atop a dual density midsole comprised of a lightweight EVA and our proprietary Harshmellow™, designed to dampen vibration on rough terrain and cushion big landings.