Sizing Information RUNS LARGE: Select one size smaller than your typical shoe sizeProduct Features In collaboration with NASA Primeknit 360 upper wraps the foot for targeted support BOOST cushioning offers endless energy return Fitcounter molded heel counter for enhanced Achilles movement Torsion Spring in the midsole provides support when you need it most Stretchweb outsole with Continental Rubber offers durable traction on wet or dry surfaces Depending on the colorway, iridescent BOOST midsole The adidas x NASA UltraBOOST 20 is imported. Lightweight, adaptive and high-performance, the Women's adidas x NASA UltraBOOST 20 Running Shoes take space-inspired detailing to the next level. In partnership with NASA, this powerhouse sneaker gets an out-of-this-world update. Join the space race in these must-have sneakers.