ALTRA. AL0A5471020. MENS PROVISION 5. BLACK GREY. Inside the Provision 5 is a fresh new approach to guided natural foot movement with features you ll recognize as soon as you slip it on. Like the contoured surface of the insole designed to immediately engage with the nerves of your feet. The refined InnovArch offers a tailored fit and encourages a natural step cycle and the GuideRail brings extra medial support but only when it s needed. Support steps forward with the Provision 5.