The upper part of the boot is closed swiftly and with precision via a single H4 BOA® dial on the tongue. We used BOA®'s TX3 textile laces to drop even more weight, add durability and give a more natural feel to the closure. Inside, our heat-mouldable Bronze Level Liner with Single Density Footbed will keep you supported, snug and warm. 1:1 lasting means we used a specific shell, liner and footbed for every full and half size. Comfortable? Very. Like the rest of our range, the Sierra uses an asym shape on the outer part, meaning that the boot sculpts perfectly to our binding hibacks and ensures optimum power transfer. That applies whether you’re riding the bunny hill, the groomers or the pow stashes at the resort. The Sierra is awesome value, and allows access to Nidecker bootfeel and tech without breaking the bank.