Under Armour UA Mens Micro G Limitless Running Trainers Overlay uses a synthetic material on the lateral side for lightweight protection & leather on the medial side for durability Full-length Micro G foam turns cushioned landings into explosive takeoffs Form-fitting compression half-sleeve wraps your foot in a tight layer of support Strategically placed rubber traction covers high impact zones for greater durability with less weight Added cushioning in the heel & strategic flex grooves in the forefoot work with your natural stride