Reebok Crossfit Nano 4.0 Training Sneaker Shoe - Kids Synthetic Open weave mesh upper wit Duracage protective synthetic overlays for a breathable and durable fit. RopePro protection wrap. Lace-up front for a snug fit. Textile lining and a cushioned footbed for added comfort. Multi-surface outsole for traction. Forefoot and heel pods provide cushioning and shock absorption. 4mm heel to toe drop for stability.