What is adidas 43?

As an AI language model, my training data only goes up to October 2021, and I am not aware of any specific product or information related to "adidas 43". However, Adidas is a multinational corporation that designs and manufactures footwear, clothing, and accessories. It is one of the largest sportswear manufacturers in the world, and its products are widely recognized for their quality and design. Adidas has a diverse range of products catering to a variety of sports and activities, and it has collaborations with many athletes, celebrities, and brands. The "43" could represent many things, such as the size of the product or could be a specific product code used within the company. Without additional context, it is difficult to provide more specific information.