This seems to be the new Racing Club de Lens 09/10 Home and away kit made by Reebok.
The club's nickname, sang et or (literally, 'blood and gold'), comes from its traditional colours of red and gold. It was in 1924 that the red and gold colours appeared.
The legend says that Mr Moglia, president of the club from 1923 to 1930, chose the colours of the Spanish flag after someone from the club remarked that the ruins of the Saint-Léger church they happened to be walking by that night were the last remains of the Spanish occupation in 1648.
People also say that the colours come from the coal mines: the red for the blood of the miners and the gold for the coal which was valuable at the time.
The new RC Lens shirts are not yet officially unveiled, this is a leaked picture.
Thanks to Nalbi