Flex grooves in the outsole of this girls' minimalist running shoe enhance flexibility for a barefoot-like feel. Seamless synthetic and mesh upper for lightweight support. Dynamic Fit system in the midfoot and molded sockliner for a comfortable, snug fit that wraps the foot and moves as you run. Fused Phylite midsole/outsole for excellent cushioning and support with a lighter weight. Waffle pistons and abrasion resistant carbon rubber on the outsole for impact protection and increased durability.