Players at the tournament are wearing Puma shirts made from a fabric the German brand calls Ultraweave.
Designed to be extremely light and to minimize friction during play, the material is promoted as the fastest football jersey in the game.
Puma says a typical Ultraweave top weighs about 72 grams, consists largely of recycled polyester, and features four-way mechanical stretch refined through years of intensive wear testing.
In a statement to BBC Sport, Puma noted that because football is a high-contact sport, jerseys can be affected under severe force or extreme physical stress, but stressed that such instances do not hinder player performance.
The company added that player feedback consistently favors lighter kits for peak performance, so it prioritized low weight alongside freedom of movement, breathability, and comfort in development.
The fabric feels paper-like to the touch. Fan “authentic” jerseys use the same material, while “replica” versions do not.
Online reviews often praise the material’s breathability and comfort, but frequently question its durability.
Puma also supplies kits for Austria, Ivory Coast, the Netherlands, New Zealand, Portugal, Senegal, and Switzerland.