The Nike Free Flyknit 4.0 'Electric Green' combines a one-piece woven Flyknit upper with deep hexagonal flex grooves to offer a lightweight and barefoot-like running experience. The Flywire cables, known for their strength and lightness, contribute to a customized fit by integrating with the laces to secure the foot based on individual comfort and tightness preferences. Additionally, the durable rib-knit collar provides a snug fit, while the wider-gauge woven mesh at the toe box and sides enhances breathability.