NEW AP+ MIDSOLE: With AP+, Mizuno has engineered a midsole polymer that provides fantastic cushioning mile after mile. Runners will actually see the benefit of AP+ in the increased durability of the midsoles, but more importantly, they will feel the benefit every time they take to the road. A high-tech formulation using multiple polymer types gives AP+ its exceptional performance in terms of cushioning durability, increased rebound and springy feel. Extensive testing has shown that even after 600km of running, the cushioning performance of AP+ stays close to its maximum. Other polymers lose a high proportion of their cushioning properties quite early in their lifetime. But AP+ retains 80% if its cushioning, even after 600km, keeping that fresh out of the box feel. Comfort is accentuated by the unique rebound properties of AP+ which gives it its springy feel. With every impact, AP+ recovers more quickly and more completely than standard midsole polymers giving the shoe a spring which makes for a fantastic ride.