Mizuno Be Strength And Conditioning Training Shoes Activation Insock - This replicates the unique innovation of Waranji sandals, it allows the toes to move up and down and increases muscular activity and strength. DFC (Dynamic Function Heel Counter) Heel Cup - Cups your heel to improve its natural function. Forefoot Flex Grooves - Enhances flexibility for a more natural, efficient range of motion. Synthetic Suede and Leather Upper - With air vents for and breathability, keeping your feet nice and cool during intense workout. Skeletal Outsole Design - This highly grippy and lower to ground outsole helps your foot adapts to the ground better and improve landing efficiency.