Description of Nordica Speedmachine 10 Ski Boots When it comes down to it, you got the need…the need for speed! With high performance, power, and precision the Nordica Speedmachine ski boots are like a 400 hp engine that pierces the snow with control and precise turn initiation, progressive flex, and a high degree of rebound. Nordica ski boots designed for downhill speed junkies. Features: Sizes:MP 24.0- 31.0 Shell and cuff material:Transparent Polyether bi-injected Liner:PFP Precision Fit ootbed:Precision Fit Flex index:110-100 Buckles:4 Micro Alu + 2 Servolock Velcro strap:POWER DRIVER Super 35 mm Rear spoiler:Performance Spoiler Easy entry system:HP SLIDE-IN Sole:Anti-Slip Canting:Double +/- 2° Flex adjuster:Hard/Soft