The adidas Alphaedge 4D Stella McCartney Core Black is a result of designer Stella McCartney's long-term collaboration with adidas. This women's-exclusive sneaker features a sleek, seamless Primeknit 360 upper that expands and contracts for a supportive fit. The new design includes a sock-like collar with McCartney's branding around the ankle. Its midsole is digitally printed using adidas 4D technology, combining light, oxygen, and resin to achieve impressive energy return.