Ear covers and a strap for joining the ear covers. Each ear cover includes an inner cup over the ear, an outer cup over the inner cup. The cups are shaped to define an inner space between them in which an end region of the strap is guided to move lengthwise with respect to the ear cover. A channel on the outside of the inner cup receives a flange on the strap for guiding its longitudinal movement. The rims of the inner and the outer cups are connected and a protective covering cloth may be at the rims for contacting the user's head around the ear.