Primeknit sock upper with an inflated cage construction for the best support and stability /
UB21 Franchise tooling /
BOOST is our most responsive cushioning ever, 6% more BOOST than in UB19, leads to a softer step with no compromise in functional cushioning /
Mid- long distance <10k run
Composition: 98% Recycled Polyester, 2% Spandex.
