Karhu's first product innovations were javelins and discuses: they taught Karhu firsthand the principles of forward momentum. Karhu then applied those principles to footwear. The same way javelins and discuses fly farther with less resistance, the more efficient running can be when the foot follows a natural path. Karhu's patented fulcrum technology collaborates with the foot to convert your body's natural energy into forward momentum resulting in a ride that is more efficient, more balanced and more forward. Karhu's engineering makes running what it should be: forward, fluid, fast.