Adidas Reveals the UltraBoost 21 — Here’s How the Brand Improved the Beloved Running Shoe Franchise

January 14, 2021

The sneaker features Primeblue upper, a recycled material that incorporates at least 50% Parley ocean plastic, and an all-new Adidas LEP (Linear Energy Push) torsion system which provides a 15% increase in forefoot bending to produce a more responsive stride. Footwear News