The small and medium companies in Korea are seeking for the strategies to advance into the overseas market for sustainable growth based on their growth and competitive advantages in the domestic market environment. However, in order to respond to the industrial environment of different markets and compete with local companies, they need to develop the strategies for market expansion and localization to meet the different characteristics of each market. One of the domestic outdoor clothing brands, BlackYak, has been advancing into the European and the U.S. markets at the same time, starting from the Chinese market. As enormous resources and efforts need to be put in to target such wide areas simultaneously, the companies are faced with the strategic tasks to accumulate global capacity and improve the achievements as soon as possible. In addition, given the circumstances of the domestic outdoor clothing market with reducing profitability as it reached its maturity, BlackYak needs to focus on improving its effectiveness in the global market and make tangible achievements. This case study will suggest the proper strategic implications for advancement into the global market and localization based on the accumulated competitive edges of the domestic small and medium companies, which are proactively seeking for the strategies to enter the overseas markets.