Team Detroit will develop and focus the brands of Warrior Sports and Brine, creating an international campaign for both brands that will launch in the spring of 2009 across television, online, print, experiential and in-store.
The agency will also redevelop brine.com. The redesigned site is scheduled to launch in April 2009.
David Morrow, president of Warrior Sports, said: "As we grow our brand internationally, it made sense to select an agency with a global network, in our own backyard.
"We need an agency with all of the marketing tools and capabilities under one roof. From product development to package design and media planning, JWT Team Detroit is a one stop shop for us."
Warrior is a global manufacturer of equipment, footwear and apparel for lacrosse and hockey.
It is the market share leader in the lacrosse industry and claims to be the fastest growing brand in the hockey market.
George Rogers, chief executive of Team Detroit, said: "This is a huge win not only for our agency, but for our region as well.
"Our group is elated to grow along with a company who is expanding its operations in southeast Michigan, and growing its brand globally."