Which red grape is commonly used in blends to add structure to Malbec?

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Blending Malbec with a grape that adds backbone and structure is common. Cabernet Sauvignon brings firm tannins, higher acidity, and strong aging potential, which give the blend a solid framework and the ability to age gracefully. This makes it the classic partner to Malbec when winemakers want a more Bordeaux-style profile and more depth beyond fruit and softness. Merlot contributes softness and roundness, which can balance ripe Malbec but doesn’t add the same level of structural grip. Syrah can add color and spice, but its primary role isn’t to supply the main structural backbone. Pinot Noir is lighter in tannin and body, so it doesn’t contribute to structure in the way Cabernet Sauvignon does.