As football remains the most popular sport in the 21st century, the material of the ball has completely changed over the centuries; from being made out of animal skin, to being lined with multiple layers of polyester or cotton.
足球到現今21世紀，已是最受歡迎的運動，但球的材料在幾個世紀以來已完全改變：從動物皮膚製成，演變到到多層聚酯，或是棉花襯裡。