Great for Walking or Running Only worn once! The Provision continues to evolve, innovate and push the boundaries of what a support shoe can be, and the Provision 4 is no different. This updated model features our Guide Rail™ technology to offer extra medial guidance, but only when needed. New to the Provision 4 is our InnovArch™ technology, an innovative arch feature that connects mind and body to encourage a natural step cycle. If you’re looking for everything you love about Altra with added support, the Provision 4 is your shoe.