Continue reading below ↓ Revealed by adidas two days ago, the Ultraboost 21 has added a few new performance features. There’s the LEP, or Linear Energy Push, Torsion system — a thin thermoplastic bridge between the forefoot and the heel which promises a “15 percent increase in forefoot bending stiffness.” There’s also more Boost than ever before; the midsole packs in 6 percent more Boost capsules for more comfort and support, fit into a more pronounced heel curve. Continue reading below ↓ Of course, the style has also drastically changed. The Three Stripes now lie on a translucent plastic badge, and the signature heel frame from the 20s has been filled in completely. In the launch ‘Cloud White/Core Black/Solar Yellow’ colorway, striking racing lines energize the silhouette.