This is our most accomplished triathlon shoe to date! The perfect balance between the triathlon specific needs and raw performance without sacrificing comfort. Exo Jet Carbon outsole Designed to increase stiffness and provide excellent toe to heel airflow. CFS Custom fit System 100% moldable upper, breathable laminated microfiber leather complete upper for ultimate comfort, maximum power transfer and support. Heel retention strap HRS Maintains heel in place while power stroke, maximizing power transfer. Molded toe box bumper and heel cup Maintains the shape of the shoe during transition while providing ventilation and stiffness. Reverse power belt 2 reverse velcro straps reinforced with Kevlar band. Super fast in transition, without compromising support. Increased stiffness for maximum power transfer. Cycling mesh upper Amazing ventilation without loosing stiffness. Weight size 411 shoe 310 g11 oz. 2 reversed velcro straps closure Easy slip on and quick to attach. Ergo Air interchangeable.