Pure Boost Shoes - These super-comfortable adidas by Stella McCartney Pure Boost shoes are ready for travel. A pure boost build means there is nothing between your foot and the midsole foam, allowing you to better experience the shoe's energy-returning cushioning. Sock construction and comfort straps simplify the look and allow for faster lacing. boost 's energy-returning properties keep every step charged with an endless supply of light, fast energy. Textile upper with mesh windows and forefoot camo print. Hook-and-loop elastic strap lacing. Sock construction. Heel cage. Rubber outsole.