The invention relates to a passive hearing protection earplug for being worn at least in part in the ear canal (12) of a user, comprising a hard shell (20) having an elasticity of from shore D 85 to shore D 65 and pulling means (26) which are adapted for being manually operated by the user and which are provided at the outer end of said shell, said shell having an outer surface individually shaped according to the measured inner shape of the user's ear canal and outer ear (18). The shell has a size and an outer shape which are adapted to enable said shell to be manually moved, by seizing the pulling means, from a sound attenuation position into a communication position from which it is automatically returned into the attenuation position by elastic forces exerted by deformed parts of the user's ear canal and concha upon release of the pulling means. The invention also relates to a use of such an earplug and a method for manufacturing such an earplug.