The Nike ReactX Infinity Run 4 'Blueprint Pack' utilizes a white Flyknit upper designed to hug the foot in a sock-like fit. A speckled blue Swoosh, along with an insole graphic depicting a skeletal foot, takes inspiration from the sketchbook of Nike co-founder Bill Bowerman. The performance running shoe rests on a lightweight ReactX foam midsole, featuring a rocker-shaped platform for a smooth transition. Underfoot, the black waffle-traction rubber outsole yields optimal grip.