Design: Heel pull tab Combines the flexibility you love with a secure design that will help keep you close to the ground In-Shoe Comfort: New cushioning is lighter, softer and more responsive than previous versions Laser-cut grooves on the sole make it flexible The upper uses a breathable knit material throughout to give your foot room to stretch as you run Flywire technology loops through the laces on the side for midfoot to keep your foot in place Durability & Traction: Rubber at the forefoot and heel give you the durability to keep you going Additional Details: Knit upper made of at least 87% recycled material by weight