Trainers made from merino wool, sugar cane, eucalyptus fibres and even discarded crab shells? No, it's not magic, it's Allbirds. Sustainability and comfort are the focus of the San Francisco-based brand. The former is achieved by its use of natural materials and innovative processes which don't wreak havoc on the Earth, while the latter is proven by the cloud-like soles, temperature-regulating wool composition and thousands of five-star reviews.Allbirds FSC-certified eucalyptus tree-fibre low-top trainers100% FSC-certified eucalyptus tree-fibreSlips onLow top, round closed toe, one-piece upper, nylon eyelets, heel collarMachine wash coldUpper: 100% FSC-certified eucalyptus tree-fibreLining: 100% ZQ merino woolSole: 100% FSC-certified natural rubber