The addition of the Boa Closure System makes the F.I.T. Boa and Alexis Boa the best engineered fitness skates ever produced by K2. Building the K2 Softboot around a Boa Closure System creates the ultimate in fit, comfort, and ease in a K2 skate. Boa eliminates pressure points, provides the most even fit possible, and can be fine-tuned mid-stride. A DC Aluminum Frame and Stability Plus cuff create the support and stability needed by the speeds generated by ILQ-7 bearings and 84mm wheels.