This trainer can withstand the rigors of a fast-paced group class or a heavy day in the weight room with loads of grip, a stable heel, flexibility under the toes and side-to-side support. Feel the 360-degree comfort as you flow through the rhythm of the day, shifting from to-do-list defeater to workout warrior. See the speckles on the outsole? That means it's constructed with at least 8% Nike Grind material, made from scraps from the footwear manufacturing process.