Adidas Yeezy is a collaboration between German sportswear brand Adidas and American rapper Kanye West. The Adidas Yeezy 750 Boost "Grey" was the first sneaker to release from this collaboration on February 23, 2015. The second shoe to release was the Adidas Yeezy Boost 350 "Turtle Dove". "Yeezy Season 1" was the first apparel collection to release from this collaboration. It was officially released on October 29th, 2015. The Adidas Yeezy 750 Boot was also part of this collection and it was released in four different colorways. The name "Boost" refers to a material used by Adidas.