Designed to be a standard fit, not too tight or too loose.Introducing the adidas By Stella McCartney Ultraboost Dna, a perfect fusion of performance and sustainability. This running shoe features our most sustainable upper to date, crafted from Primeblue ocean plastic yarn through innovative Primeknit technology. With the added benefit of Boost technology for exceptional energy return, every stride becomes a statement in this stylishly comfortable gear. Complete with an adidas by Stella McCartney logo, lace up for your best run yet.