Reebok Crossfit Nano 3.0 Men's Training Shoe Mesh 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 Dual Density for rearfoot stability and impact protection Die Cut Ortholite sockliner RCF Natural last enables full foot dispersion for greatest stability with Medial/Lateral Rope Guard and multi-directional outsole splay zone