Southampton will wear shirts made by Under Armour from next season after announcing a seven-year contract with the American sports firm.
Under Armour, who already work with the likes of Tottenham, Andy Murray, Jordan Spieth and Anthony Joshua, will replace Adidas, who began a three-year partnership with the Saints in 2013.
Under Armour have pledged to bring innovation to the first-team shirts, including infra-red technology to combat cold weather, and to provide 5,000 pairs of footwear to the club’s academy by 2023.
Southampton chairman Ralph Krueger said: “Under Armour shares similar values to us in that they achieve success through a combination of hard work and strategic thinking.
“At Southampton, our determination to succeed is accompanied by a commitment to develop athletes as people, and this partnership reflects this.
“Our challenge now is to retain our ‘underdog’ mentality whilst entering a sustained period of success.”
Peter Murray, Under Armour’s vice president of global sports marketing, added: “We look forward to providing game-changing technologies and product innovations to further support the club’s on pitch performance.”
Southampton are currently seventh in the Barclays Premier League table. Ronald Koeman’s side play Everton at Goodison Park on Saturday.