Synthetic Textile, synthetic and leather upper gives comfortable support. TecTuff material is water- and abrasion-resistant. Nike’s largest heel unit to date, the 270 Air unit gives bouncy cushioning. Mid-height bootie stretches for a snug, sock-like fit. A drawcord attaches to the heel pull tab and the top of the heavy-gauge zipper on the tongue so you can easily and quickly unzip the shoe. A buckle secures the strap, which slides open easily so you can buckle and unbuckle it with 1 hand. Waffle-inspired rubber coverage on the outsole gives durable traction.