This is the actual Racing de Santander away kit for the 23-24 season, replacing the first one.
That grey and green away... kit has been removed by the club due to fan protests, then they released this new kit based on the one launched ten years ago by Asociación de Peñas Racinguistas (APR) for the club's centenary, when Racing were about to disband because of neglected managing of previous owners.
That special shirt by APR was also produced by local brand Austral, while actual Racing de Santander centenary kits were made by Kelme.