the QST Spark lets you stomp airs

and performance

Take your running to new heights with XPOP PU foam and new MIZUNO ENERZY midsole that delivers an all-new plush experience

Chest Strap Measurement: Approximately 26in to 44in

providing ample room in the toe box and midfoot for a comfortable and natural fit

Tecnica Firebird R 90 SC Ski Boots Size:27.0 the QST Spark lets youCrafted specifically for younger racers who need a custom design to match the geometry of their body, the Firebird R 90 SC (Short,Cuff) offers true race performance with a shorter cuff and softer flex. The short cuff and flex curve allow the junior racer to efficiently and effectively flex the boot to ensure proper energy transfer. Equipped with a race liner for a more precise feel, the Firebird R 90 SC is supportive and stable for crushing gates at