The Allbirds Wool Tree Breezers is their take on the classic women's ballet slipper. It is the perfect spring-summer-fall shoe, ideal for temperate weather. The wool Tree Breezer is made from soft premium merino wool. They are soft and cozy and feel like a slipper but the sole is contoured so there is arch support. The inner sole is made from merino wool so it is perfect to wear barefoot. Best of all the shoes are light and easy to carry for travel.