Heat. Moisture. National pride.

These were top of mind as Nike designed its uniform kits for this year’s World Cup, including for football powerhouses France and Brazil as well as the U.S. and Canada in their role as host nations.

In a tournament that has seen storm delays and temperatures hovering around 90 degrees Fahrenheit (32 Celsius) in some locations, the first step was to ensure players’ performance and comfort.

Phil McCartney, chief innovation, design and product officer for Nike, said the company worked with athletes, coaches and football federations to understand how uniforms affect the game.

“We also talk to fans — so what does it mean to wear a Uruguay jersey, what does it mean to represent France, what does it mean to play for Canada?” McCartney told The Associated Press. “We take that and we merge that with all the science and the innovation to make sure that we have beautiful designs.”