These Wool Running Shoes Keep Your Feet Smelling Fresh

A former professional soccer player from New Zealand is launching a sustainable, biodegradable wool sneaker.

When you’re a professional soccer player, companies practically pelt you with free shoes. Just ask Tim Brown, who spent his twenties playing for New Zealand’s national team, going all the way to the 2010 World Cup in South Africa. “I got tons of shoes from brands like Nike that were brightly colored, covered in logos, and made of synthetics,” Brown says. “But I was always interested in finding a shoe that was simple, beautiful, and made from natural materials.”

Tim Brown

So in his spare time, Brown set out to invent a sustainable, biodegradable shoe. He would go down to the local fabric store to find alternative materials. Since he was in New Zealand, a country where there are six sheep for every human, wool was abundant and renewable. But wool also has many properties that you might want in a shoe: It regulates temperature, wicks away moisture, and can help to control bad odors.

Brown tinkered with creating a high-performing wool shoe. His main struggle was developing a wool fabric that was strong enough to use in a shoe. “Nothing existed,” he says. “That probably should have been a sign that I should stop, go back to my Playstation, and live a quiet, simple life somewhere in New Zealand.”

Instead, he applied for a grant from the New Zealand wool industry and with his funding began a project with AgResearch, a textile institute, to engineer a new fabric that would be tough but also soft and comfortable enough to wear without socks. The result is a patent-pending woolen material that he has used to create what he describes as “wool runners”–performance woolen shoes that can be used for working out, but also wearing every day.

Two years ago, he launched a Kickstarter campaign to see if there was a demand for his product, which was pitched as a shoe you could wear without socks without your feet getting smelly. And there certainly was demand: In five days, he received over $119,000 from 970 backers. The shoes were so popular that he decided to turn this project into a career. He teamed up with biotech engineer and renewable materials expert Joey Zwillinger to improve the construction and introduce additional sustainable materials such as a vegetable oil-based polyurethane insole. Today, they launch their company, Allbirds, and a line of wool running shoes that cost $95.

Joey Zwillinger

Brown’s not the only one who is thinking about how to integrate wool’s properties into shoes. London-based Mahabis has developed a woolen slipper with a sole that can be worn outside. A Swiss startup called Baabuk has invented a wool sneaker. And in the U.S., Tom’s has developed a line of wool shoes. Allbirds hopes to make inroads into this market among consumers who are interested in sustainability in their footwear, but who also want hardy shoes that can be used for going to the gym or for a run. The shoe fits nicely into the atheleisure trend of products that allow people to go from athletic activity into their everyday lives.

Manufacturing a wool shoe from scratch is a complex process. Shoe makers often rely on large companies that produce leather and other synthetic materials that are used to produce shoes. “We discovered that few shoe companies manage the supply chain and the raw material sourcing closely,” Zwillinger says.


Innovating at the level of fabric meant that Brown and Zwillinger had to do a lot of the groundwork themselves: They source the merino wool from New Zealand, create the fabric in an Italian mill, and have the shoes assembled in South Korea. To fund this process, the cofounders landed $2.7 million in a seed funding round led by Lerer Hippeau Ventures, with investments from Dave Gilboa, the cofounder of Warby Parker, and Jeff Raider, the cofounder of Harry’s. “We thought this was a great opportunity to build a company, rather than producing a single product,” Zwillinger says. “We’ve had to customize the supply chain, so we want to create a brand and introduce a pipeline of products.”

I had a chance to try the shoes on. They are very soft and comfortable, with simple, clean lines. The machine washability is a plus, since they are best worn without socks. Even the box they come in is designed with an emphasis on sustainability: Rather than shipping out a shoe box within a shipping box, the shoe box itself is a mailer. Allbirds is currently working on new fabrics and shoe designs that they hope to launch by the end of the year.


About the author

Elizabeth Segran, Ph.D., is a staff writer at Fast Company. She lives in Cambridge, Massachusetts.