UA Micro G Limitless Running Shoes Limitless by name, Limitless by nature. The Under Armour Micro G Limitless Running Shoes feature a full length Micro G foam midsole for endless energy to keep you going whatever your sport, wherever it takes you. The upper is constructed with a breathable mesh and seamless overlays to provide ventilation and structural integrity. Add to this an adjustable heel lock that works with the lacing system and you have a locked down, streamlined feel. Transitions are made smoother with anatomically positioned flex grooves and strategically placed cushioning at the heel and arch for a natural ride that works with your natural stride pattern. The UA Limitless features a full length Micro G midsole, this thin and light foam is super responsive to support your stride and turn cushioned landings into explosive take offs. Added cushioning in the heel and strategic flex grooves in the forefoot work with your stride to provide a smoother, more natural transition from heel strike to toe off.