The GS:BLK is the ultimate trail equipment for long distances. Precision fit is paired with maximum comfort and responsiveness to propel you through the mountains faster. Features include: 100% beaded HTPU external midsole Proprietary drop-in midsole blend elastomer (removable) GS:BLK is not compatible with custom insoles PerformFit™ Wrap activated by BOA® Fit System featuring multidirectional dual-dial Li2 Carbitex GearFlex plate compatible (plates sold separately) Michelin Fiber Lite outsole with 6.5mm long lug Spacer mesh upper with strategically placed high-tenacity fiber Design details are a mix of matte and shine black