Nike Zoom LeBron 21 “Optimism” On Feet & In Hand Looks 。The Nike LeBron 21 Optimism brings a psychedelic, mismatched color gradient to the LeBron 21 silhouette. The left shoe of the Optimism Nike LeBron 21 fades from Bliss Pink to Laser Orange, while the right shoe displays a color gradient from Photo Blue to Vapor Green. The mesh upper boasts a 360-degree zonal cabling system—a series of wavy lines that radiate from the midsole and provide superior containment. These multicolor lines create an optical illusion, giving the upper a more molded appearance. Contrasting vibrant hues can also be found on the Phylon midsole, which houses Zoom Air cushioning in the heel and forefoot. Finally, the TPU shank plate supports the foot and provides structure.