Nike's perenially popular Free Flyknit 4.0 silhouette gets an update with the "Dark Obsidian." The model's purple, teal and crimson colorway presents a knitted upper mottled with a seemingly iridescent underlay, and anchored by a black herringbone pattern alongside a white midsole and Swoosh logo. You can purchase the Nike Free Flyknit 4.0 "Dark Obsidian" now at Nike.com for $120 USD.