The Fire Arrow boot is a completely new design built to meet the needs of modern skiers who create greater lateral forces, increase inclination and ski at faster speeds.The Firearrow boots address these new demand with an entirely new shell design to enhance lateral precision, progressive forward flex creating easier ankle articulation and a 45 degree closure system for maximum heel retention. The F1 has the highest performance, stiffness, progression and rebound out of the Firearrow collection. Stiffness: 16.0, Progression: 2, Rebound: H, Last:100