Altra's Provision continues its tradition of innovative dynamic support and comfort. The Provision 3.5 features a revamped durable mesh upper, GuideRail™ for stability, and a sleeker overall profile. The built-in heel varusing, GuideRail™ and tripod Stabilipod™ system remain the same and help to enhance your naturally stable foot zones. These features combined with Altra's signature Zero Drop™ platform and FootShape™ toe box, provide a natural, supportive fit that will keep you strong for the long run.