Kay Brothers operates in McLaren Vale, the warm, maritime-influenced region of South Australia's Fleurieu Peninsula. The winery focuses on fortified and dry red wines drawn from varieties suited to the region's Mediterranean climate. Its Liqueur Muscat, made from Muscat Blanc, represents the fortified tradition of the area—a style that demands extended aging and careful oxidative handling. The Block 6 Shiraz and Griffon's Key Grenache Reserve showcase the winery's work with the dark-skinned varieties that define McLaren Vale: Shiraz thrives in the region's warmth, developing ripe, structured wines, while Grenache offers a lighter, more elegant counterpoint. These wines have been assessed by Wine Advocate, Wine Spectator, Wine Enthusiast, Decanter, and Falstaff.