These lightweight Allbirds tree Breezers women's flats provide a better level comfort. They're crafted with a silky-smooth, eucalyptus tree fiber and a midsole made from sustainable sugarcane. A rounded toe, slip-on style, and comfortable ballet design means no break-in necessary and immediate comfort. Ribbed collar provides a perfectly secure fit. Easily transitions from day to night. SweetFoam outsole made with sugarcane-based green EVA. Machine washable, air dry.