Of course, adjusting shirts to climatic conditions is not exactly a new idea. Cameroon national team surprised the football world by unveiling a radical sleeveless shirt design in 2002, wearing the gear on official games and even winning African Cup of Nations with them.However, the FIFA put afterwards a stop to this fashion experiment and banned sleeveless shirt design from the World Cup, forcing Cameroon to revert to a more traditional format. In any case, this experiment remains one of the most inspiring design stories in football and has largely prepared the public for what Hummel is doing now.

Bron: Footballmarketingmagezine.com