The four-time major champion will use a variety of the company's produce and wear the logo on his bag and on his headwear. Els has won three majors with different equipment companies: Lynx (1994 U.S. Open), TaylorMade (1997 U.S. Open and 2002 British Open) and Callaway (2012 British Open).
Terms of the deal were not disclosed.
Adams Golf was acquired in 2012 by TaylorMade-adidas, so the 44-year-old South African could be using different products throughout his bag. Els last month signed a footwear deal with Ecco to wear its street shoes.
Els was inducted into the World Golf Hall of Fame in 2011. He is No. 27 in the world going into the 2014 season.