These small moths can be recognized by their bicoloured hind wings. The base of their forewings is clear, grey, green or whitish, and the other extremity is darker, either reddish brown or dark grey. They range in size from 11 to 20 mm.
The white or yellowish caterpillars are hairless, with orange-brown heads. They moult five times and measure up to 12 cm long in the last instar.