Women's Adidas Ultraboost 20 'White lridescent' size 8.5 I bought these first in black for the gym, and due to the maximum comfort and stability, LOVED them. I decided to buy another pair in white, without realizing the iridescent finish wasn't quite my style. I wore them to the gym only twice to give them a fair chance, but couldn't get past the iridescence. I did, however, buy another pair of the black because they're that great! The upper is made with Primeblue, a high-performance, recycled material that contains at least 50% Parley Ocean Plastic. The monochromatic white aesthetic is enlivened with a subtle iridescent finish on the sneaker's molded midfoot cage and full-length Boost midsole. The Torsion system provides support and stability, while the Continental rubber outsole ensures grip and durability.