The adidas UltraBoost 22 'Legacy Indigo' pairs earth-friendly materials with a responsive ride. A deep shade of blue is executed on the upper, featuring Primeknit construction made with 50% recycled Parley Ocean Plastic and 50% recycled polyester. An updated version of adidas' iconic Torsion system, dubbed Linear Energy Push, works in tandem with a full-length Boost midsole to deliver energy return with each step. Underfoot, Continental Better Rubber is utilized on the outsole for grippy traction.