The Nike LeBron 21 "Cool Grey" is a colorway of LeBron James's twenty-first signature shoe with Nike Basketball in an almost-monochromatic grey finish. The popular "Cool Grey" theme gives the Nike LeBron 21 a versatile look, as the grey tone appears on the breathable mesh base and ribbed upper. An oversized and sleek Metallic Silver Swoosh appears on the lateral side. LeBron's signature branding can be found embroidered on the tongue. Underfoot, the rubber midsole appears in Cool Grey matching the shoe's upper design. Release date: April 1, 2024. Rubber/Fabric. Colour: black