Adidas’ collaboration with environmental group Parley continues to grow, this time with the release of another Ultra Boost style. The latest Parley Ultra Boost is a women’s shoe from Adidas’ Stella McCartney collection. Pairs are available now directly via Adidas here.

The silhouette used is the Adidas Ultra Boost X, which differs quite a bit from the original Ultra Boost. The shoe has recycled ocean plastic around the heel counter and an insole with Parley’s logo.

Adidas first unveiled its Parley sneakers at a 2015 event at the United Nations headquarters in New York City. The brand has since upped its commitment to working with the organization, pledging to use more recycled materials in its sportswear going forward.