The WK400 balances plate technology, constant curve geometry, and last shape with a high-energy midsole to give you the feeling of forward momentum.

• Patent-pending constant curve geometry of
  KEEN.CURVETM technology makes walking feel
  more like rolling.
  
• WK400 plate technology helps maintain constant
  curve geometry for a smooth, rolling feeling.
  
• KEEN high-energy midsole enhances comfort and
  the feeling of forward momentum.
  
• Our multi-surface outsole provides stability and
  traction from trail to asphalt to track.