ADIDAS BY STELLA MCCARTNEY ULTRABOOST ULTRA-LIGHTWEIGHT RUNNING SHOES.Support your workout goals while you support the planet with the latest iteration of our best-selling Ultraboost sneaker.Made with recycled plastic materials, the adidas by Stella McCartney Ultraboost Sandal is the perfect mix of style and function, with nods to both Stella McCartney's sleek visual identity and adidas' performance-first design approach.Set on an energy-returning Boost midsole, the shoes are so comfortable you'd be forgiven for thinking you were running atop a cloud. A Primeknit upper adapts to your foot, supporting and empowering you to keep going, and the chic cutout detailing keeps things light and breezy as the temperature starts to rise.