The Zero-X uses an interlocking, double-stitching system instead of glue, which it says results in energy savings and environmental benefits as fewer chemicals are used.

Each upper uses an average of 13 recycled plastic water bottles and outsoles are made with husk from agricultural by-products and with laces made with bamboo. For every pair sold, a tree will be planted.

Twisted X CEO Prasad Reddy said: "We're proud to be on the forefront of this initiative, removing such harmful processes from our factories and environment. When we were challenged and told that we had to have a little glue on the footbed and shoe lining, we kept trying and worked to ensure this no-glue shoe means no glue, not even one drop."

Twisted X Global Brands – owner of Twisted X, Twisted X Work, Tamarindo, Black Star Boots and CellSole – creates footwear for men, women and children across the lifestyle, work, outdoor and western categories.