The Sienna"s stylish, high performance design comes complete witha PowerPlus thermo-formable EVA Liner, BOA closure system andlateral stiffening, to ensure top performance and comfort. Combine with the Sienna board and binding for an unreal package! Key Features of the 5150 Sienna BOA Snowboard Boots: BOA® closure system provides ultimate fit and on-the-fly adjustmentPath CTS Outsole with durable rubber for a grip that won"t slipPowerPlus EVA Liner with Power-Lace closure, Lace Lock, Performance Ankle Pocket, Flex-Toe design and removable insoleDurable body construction with lateral stiffening overlaysMulti-Zone ankle flex points