The "12th Fan" is now a best-seller.

Seattle Seahawks jerseys with "FAN" on the name plate and the No. 12 are now the 10th best-selling jersey this season, according to sales on NFLShop.com from April 1, 2013, through Feb. 28, 2014.

Seattle Seahawks jerseys with "FAN" on the name plate and the No. 12 are now the 10th best-selling jersey this season. AP Photo/Scott Boehm

Thanks in part to a Super Bowl victory, only two jerseys sold better in February on the league's official online store than the 12th Fan jerseys -- those of Seahawks quarterback Russell Wilson and Denver Broncos quarterback Peyton Manning. The strong month of sales brought the No. 12 jersey into the No. 10 spot, surpassing the sales of jerseys sold this year of both Miami Dolphins quarterback Ryan Tannehill and Washington Redskins quarterback Robert Griffin III, who sold more jerseys last year than any player in a single year in league history.

Selling the 12th Fan gear is a way around the Seahawks agreement with Texas A&M. Since 2006, the Seahawks have paid the university $5,000 a year to license the use of its trademark of "12th Man." The licensing agreement doesn't allow for Seahawks to sell any merchandise with "12th Man" on it.

With a month to go before the league's fiscal year is complete, the Seahawks remain in the No. 1 spot, selling more merchandise than any other team. Wilson (No. 1), running back Marshawn Lynch (No. 5) and cornerback Richard Sherman (No. 6) are also among the top 10 best-selling jerseys. The Broncos are in the second team spot, followed by the San Francisco 49ers and the Dallas Cowboys.