Mizuno Wave Sayonara Women's Running Shoes U4iC Wave Midsole - Providing an amazing cushioning to weight ratio. G3 Outsole - A new outsole compound that enhances traction and grip and reduces weight. InterCool - A full length ventilation system in the sole, to reduce heat and humidity. SmoothRide - Ensuring a more fluid enjoyable run, due to Flex grooves in the heel promoting natural movement from the back of your foot to the front. AIRmesh - Breathable AIRmesh upper ensuring your feet stay cool.