An earmuff (3) includes a disc-shaped elastomeric pressure-equalizing element (6′) that lies between an inner end of a cup (4) and an outer face of an annular element (7). The elastomeric element (6′) is found to provide a more consistent blocking of environmental sound. The cup inner end has a radial projection (15) that projects into a recess (19), and the elastomeric element is bent to lie between the projection and the walls of the recess.
