ALTRA. ALOA4PEA431. PROVISION 4 ROAD RUNNING SHOE. BLUE WITH LIME. What do you get when you combine support cushion and comfort-- The Provision 4. This updated model exemplifies the evolution of technical support in running shoes through our revolutionary dynamic arch feature InnovArch. This innovative feature forms a link from your head to your feet inspiring an awareness that naturally encourages a better step cycle. Pair that with the tried and true Guide Rail technology and you re ready to move more naturally and comfortably.