The Allbirds Tree Breezer flat delivers breezy comfort for everyday wear. This shoe features a secure, flexible fit and is crafted from breathable eucalyptus tree fiber. The ballet flat design requires absolutely no break-in period, making it ready to wear right out of the box. A SweetFoam outsole, made with sugarcane-based green EVA, provides a light, springy step. It's also machine washable, so keeping these flats fresh is a breeze.