Kiwi shoe company Allbirds has found a sweeter way to make shoes.
It's launching a new line of jandals engineered to leave a lighter footprint on the planet.
Allbirds is known for its eco-friendly footwear, made from wool and trees, but the challenge has always been to find a sustainable solution for the soles, which have historically been made out of petroleum-based foam.
Three years on, they've found the answer.
Effectively we've taken the petrol out and put the sugarcane in and found a carbon-negative solution to the raw material that makes up the foam," says Allbirds co-founder and former All White, Tim Brown.
Mr Brown first had the idea of shoes made more simply in Wellington in 2009.
He founded Allbirds in 2015 with entrepreneur and engineer Joey Zwillinger, launching with their wool runner, before adding a eucalyptus tree fibre shoe to their collection.
SweetFoam, made from sugarcane, is their third big material innovation. It uses the world's first carbon negative polymer, which takes more carbon out of the atmosphere than it produces.
Allbirds co-founder and sustainable chemicals expert Joey Zwillinger says even before they founded the company they had always talked about sheep, trees and sugar.
"Instead of just keeping on pumping up petroleum out of the ground and making foam or other products out of it, what we thought was ok, use sugarcane which then captures that CO2 out of the atmosphere and translates that CO2, with the help of sunlight and a little rain into something that's a useable source of carbon which is sugar. Then, with our partner in Brazil, we've taken that sugar and translated that into a foam used for shoes."
Allbirds is a small brand within a massive footwear industry that makes 25 billion pairs of shoes a year, so to have a meaningful impact it's sharing the innovation with the entire industry in the hope of starting a larger movement.
The goal is to create these materials and make them available to other people to use and hopefully together we can make products that are more sustainable and better for the environment," says Mr Brown.
Allbirds is showcasing its innovation with the launch of a jandal, which will retail at $60, then plans to roll out Sweetfoam soles on all of its shoes.