We've created the most advanced boot addition to the Phase franchise with the Phase Boa® Pro Step On® snowboard boot. This style features top-of-the-line tech to the simple, skate-inspired upper, starting with the Dual Zone BOA® Fit System paired with our patent-pending SUPERLOCK heel harness to eliminate heel slip and deliver a more responsive ride. This model is fitted withour R3 liner with PrimaLoft® insulation, our warmest and most responsive ever. BOA® Silver SS Laces.