When Allbirds founders Tim Brown and Joey Zwillinger launched the footwear brand in 2016, they wanted to make a simple-looking shoe that was logo-free. They started with a sneaker that had a wool upper, and ads claimed they were the “world’s most comfortable” shoes. Their sneakers soon became the go-to footwear of Silicon Valley executives, but they had another mission beyond being fashionable: they wanted to be environmentally-friendly. However, using a sustainability message in marketing at the time wasn’t necessarily the sexiest selling point, explained Allbirds’ sustainability lead Hana Kajimura. Read more at CNBC.