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 and wool-blend low-top trainersFSC-certified Tencel Lyocell; ZQ merino-wool blendLace-up fasteningLow top, round closed toe, water resistant, sock-like collar, panelled design, tear-resistant ripstop mudguardWipe with a clean, dry clothUpper: FSC-certified Tencel Lyocell; ZQ merino-wool blendSole: 100% rubber