Altra's Provision continues its tradition of innovative dynamic support and comfort. The Provision 3. 5 features a revamped durable mesh upper 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, FootShape™ toe box, and Fit4Her technology provide a proper, supportive fit that will keep you strong for the long run. Read more…FOOTSHAPE™ TOE BOXAllows toes to relax and spread out naturally and the big toe to remain in a straight position for more comfort, speed and stability. FIT4HER™The Fit4Her™ technology means we customize every women's shoe to the unique anatomy of the female foot. ZERO DROP™ PLATFORMPlaces your heel and forefoot the same distance from the ground to encourage natural, low-impact running form throughout your run. GUIDERAIL™A feature found on our dynamic support shoes that acts like a highway guide rail to provide guidance only when you need it. STABLIPOD™Three stability-enhancing zones act as a tripod throughout your run to help prevent excessive foot collapse or pronation. A-BOUND™ CUSHIONINGSuper lightweight EVA Foam combines with our energy-return compound to protect the feet at impact and adds a spring to each step. VARUS STABILITYThis built-in full-length wedge slopes down from the medial to lateral sides of the foot to provide extra support for those who need it. FOOTPOD™ TECHNOLOGYUnique outsole and midsole pattern maps the bones and tendons of your foot to let it flex where it naturally wants to.