1:1 Anatomic Closure: Eliminates hot spots and removes pressure from your instep Select 1:1 Power Plate: Select Grade Nylon and Composite Fiber plate for lightweight stiffness and durability Direct-Vent technology for cooling and drainage Concave shaping for ultra low 7 mm stack height, enhanced plate stiffness and anatomic support Built-in Longitudinal Arch Support for optimal support, power, and efficiency