Choose a Mitchell & Ness Legacy Jersey for your official NFL throwback. These versatile Jerseys shouldn't be limited to game-day wear, with their tough polyester construction making them perfect for layering whilst being lightweight enough to be worn on their own. The Denver Broncos were founded in '59 and team began play in '60 as a charter member of the American Football League and joined the NFL as part of the merger in 1970. Since '75, the Broncos have become one of the NFL's most successful teams, having suffered only seven losing seasons and won 3 Super Bowls.