NWOT or Box - unworn, tried on and cannot return. Navy blue. Allbirds popular ballet flats known for their comfort and use of sustainable materials. They are made with a TENCEL™ Lyocell (eucalyptus tree fiber) knit upper and a sugarcane-based SweetFoam® midsole, giving them a soft, lightweight, and breathable feel. Comfort & Fit: Praised for being incredibly comfortable right out of the box with no break-in period required, the stretchy knit upper conforms to the foot without slipping at the heel. They offer cushioning for everyday wear. Material: The primary materials are soft, silky eucalyptus tree fiber and a cushioned merino wool insole, which helps in minimizing odor. Maintenance: These flats are machine washable on a gentle cycle, though it's recommended to air dry them and hand wash the insoles separately. Style: They have a classic, casual ballet flat design with a round toe and a fitted collar.