Fitted with Intuitionâ¢ Mobile Wrap Liner. The Tongue Tied BOAÂ® Focus Closure provides a two-zone closure system for ultimate heel hold and precise fit. Tongue Tiedâ¢ delivers a secure fit in the ankle and eliminates the need for a traditional harness. Adjustable Power Strap offers added support and response. C.A.T. technology allows for a custom fit in the calf zone for increased comfort. MichelinÂ® Fiberlite Sole combines rubber with a +Slime Midsole for traction and cushioning. The Karmyn is designed as a stiffer flexing freestyle snowboard boot.