Rubber sole The Reebok Nano X2 Froning is a lightweight, competition-focused cross-training shoe designed for high-performance workouts, collaboration with Rich Froning. Key features include a breathable, perforated mesh upper for airflow, a streamlined design, and a secure ROPEPRO+ outsole for rope climbs. It also has Floatride Energy Foam for responsive cushioning and a stability clip in the heel to provide support for various exercises.