Reebok Women's Crossfit Nano 3.0 Training Shoe 100% Synthetic Synthetic sole 360 PU Cast for lightweight, seamless, engineered support and durability ETC anti-friction lining to reduce abrasion and heat build up with breathable air mesh RCF Natural last enables full foot dispersion for greatest stability with Medial/Lateral Rope Guard and multi-directional outsole splay zone