Sources: Earnhardt will sign on to endorse adidas

Dale Earnhardt Jr. on Friday will announce a personal services agreement with clothing manufacturer adidas, sources told ESPN.com.

Dale Earnhardt Jr.

Earnhardt Jr.

Terms of the deal were not disclosed.

Sources said adidas will manufacture Earnhardt's fire retardant driving suits and shoes, and the Nextel Cup star will be involved in promoting specific consumer apparel.

Friday's announcement will mark Earnhardt's second landmark personal services deal in three weeks. Earnhardt announced an agreement with Sony Corp when the Nextel Cup series was in Sonoma, Calif.

Earnhardt has yet to announce the biggest piece of his sponsorship puzzle for 2008 -- the primary financial-backer of his Hendrick Motorsports Chevrolet. Earnhardt is leaving Dale Earnhardt Inc., the company his late father founded, to drive for Hendrick Motorsports next season.

Marty Smith covers Nextel Cup racing for ESPN.com.