Run Ready Recycled mesh on the front of the shoe helps you stay cool and gives toes wiggle room. Synthetic leather around the heel gives stability and durability. Cushioned Comfort Foam underfoot and a soft insole feel plush and flexible so every step and stride are comfortable. Star-Studded Traction The rubber sole has grooves for flexibility and molded stars that give you traction in any direction. The rubber uses about 9% Nike Grind made from recycled manufacturing waste. An overlay across the toe tip gives a layer of durability if you drag your toes. The waterfall shape around the ankle (with extra padding) provides slip-in comfort.