The adhesive company's logo also moves from the back to the front of the team's shirt. The change was revealed when the 2006-2007 Guinness Premiership season kit was unveiled this week.
John Worth, marketing manager at Henkel Consumer Adhesives, which owns UniBond, said: "We are delighted to retain our long-standing partnership with Saracens and are pleased to formerly announce our sponsorship extension for the forthcoming season."
The company, which also sponsors QPR football club through its Sellotape brand, join rubgy clothing company KooGa and investment and futures broker Man Group, on the front of the jerseys.
Man Group has also changed its appearance on the new shirts and features its company name, rather than its 'M' logo.
Lena Nichols, Man Group investor relations officer, said: "We first came on board in 2004 - many Man employees and clients are supporters of Saracens, and enjoy our involvement with the club. It's exciting for us to develop the branding and introduce our group logo to the rugby world."
Car company Saab has also extended its longstanding contract for two further years to appear on the sleeve of the team's kit.
Mark Sinderberry, Saracens chief executive, said: "We are delighted with the contract extensions and now have a new sponsorship partner to take advantage of our fantastic business-to-business and business-to-fan connections."
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