Vintage 90s Diadora Football Warmup Jersey. Vintage 90s Adults' Football Collared V-Neck Long Sleeves Warmup jersey. Diadora is an Italian sportswear and footwear manufacturing company, founded in 1948. Diadora produces football boots and athletic shoes, as well as a range of apparel that includes t-shirts, polo shirts, hoodies, jackets, leggings, shorts, and compression garments. Diadora also commercializes football balls in the US market.