In this article, we look at the hikers who have completed the Tour du Mont Blanc, questioning their socialisation not only in the practice of hiking but also in the practice of cross-border mobility. We also analyse the effects of this cross-border mobility in terms of their representation of the border, as well as their opinion of the European Union. Our methodology was based on 15 semi-structured interviews. Results show that the socialisation of cross-border mobility among hikers depends on their social background. Those from the most privileged backgrounds travel the most, particularly outside Europe. These experiences of cross-border mobility have an impact on the formation of opinions and attitudes towards the EU and representations of the border. However, on the Tour du Mont Blanc, the lack of border signs and the absence of checks makes the border easy to cross. It is therefore not considered to be a barrier.