Obviously, the most distinctive characteristic of the Greta Oto is its transparent wings. The opaque borders have a dark brown coloration. In some individuals, the borders are tinted with red or orange. The wings have a span ranging from 5.6 to 6.1 cm (~2.2 to 2.4 in). The body is dark colored.
Although seemingly fragile, the wings are quite robust, enabling the glasswing to go on long migratory flights, traveling up to 12 miles a day.