In a world with a predominant eco-crisis, companies need to realign their activities to a more environmentally responsible business approach. As businesses are made by managers, who form their experience within and outside the business world, their individual decision-making behavior is of particular interest. Until today, only a few studies addressed managers rationales for pro-environmental actions, while no empirical work applied established models of decisionmaking to examine the influence of nature-related leisure activities on managers behavior. Consequently, this thesis intends to detect the role of adventure sports in the managerial decision-making process as a potential source of environmentally responsible behavior. A multiple-embedded case study consisting of interviews with four executive managers of German and Austrian companies, who have a strong connection to adventure sports, will set the basis for a content analysis. Check-up interviews with colleagues and subordinates as well as company documents will further enrich the collected data. Due to their connection to and dependence of the nature, managers with a background in adventure sports build a strong relation to the environment and develop a vigorous sense of awareness related to natural business impact. In addition to that, they use their executive decision power to make environmentally responsible decisions and to implement activities in favor of the natural environment. Consequently, adventure sports activities play an important role in the rationales of behavior as a facilitator of pro-environmental values, identities, beliefs and norms. At the same time, experiences and skills derived from these sports are integrated into managerial decisions, which help to enhance their companies sustainability and business performance. Finally, a revised integrated framework of decision-making in the context of environmentally responsible behavior of managers with a background in adventure sports is presented.