The Nike Joyride Run Flyknit 'Black Iron Grey' sneakers boast a lightweight knit upper, featuring an interior bootie construction and a one-piece foam collar to ensure a comfortable fit around the ankle. Moreover, the soft foam midsole is designed with strategic pockets beneath the foot, which house small foam beads that mold to the contours of the wearer's foot, resulting in a customized and well-cushioned running experience.