Adidas has made efforts to create more sustainable products in the past. Last year, it unveiled the Futurecraft Loop, a running shoe that is made from 100 percent recyclable materials, and in 2016, it released an UltraBoost shoe made of plastic waste removed from the ocean. The company’s Yeezy brand is also working on a clog made of algae foam. Adidas has promised to use only recycled materials by 2024.

Allbirds’ entire brand, meanwhile, is based on sustainability. The company uses alternative materials like wool and sugarcane waste, rather than leather or polyurethane in its shoes. Its first running shoe, the Tree Dasher, was released late last month and was praised both for its performance as well as its sustainable design, which uses a sugarcane sole and a eucalyptus fiber upper.

It’s encouraging to see so many sneaker brands work toward a more sustainable future. (Nike recently unveiled its line of Space Hippie sneakers, which are mostly made of scraps from plastic bottles, t-shirts and yarn.) Hopefully Adidas and Allbirds are successful, and other brands can follow their lead.