Yes / This study adopts a theory of reasoned action approach to understand consumers’ mask wearing when shopping in the context of the COVID-19 pandemic. We investigated mask wearing while shopping as a prosocial consumption behaviour whereby self-oriented benefits and others-oriented benefits are added as proposed drivers of attitudes and perceived social norms. Empirical evidence from a survey in France and Germany confirms a strong effect of social norms on mask-wearing intentions. Moreover, altruistic benefits predict mask-wearing intentions, with attitude and subjective norms as mediators. In contrast, self-expression benefits of mask wearing only influence perceived social norms and not attitudes; this effect differs between the countries. Our findings guide scholars, policy makers and practitioners to steer consumers’ mask wearing as a prosocial behaviour. / Received support from central internationalization funds of Universität Hamburg.