Silver tone/white Ultraboost 21 metallic-effect sneakers from adidas by Stella McCartney featuring sock-style ankle, metallic effect, caged design, logo print to the side, front lace-up fastening, signature cushioned Boost midsole and rubber outsole. POSITIVELY CONSCIOUS: We've partnered with Good On You — an ethical agency that rates how sustainably brands perform across various people, planet and animal welfare criteria. This product comes from a Conscious brand that performs well in relation to their impact on animals..