What factor contributes to the high tannin content in Cabernet Sauvignon?

The high tannin content in Cabernet Sauvignon primarily results from the thicker skins of the grapes. Tannins are polyphenolic compounds found in grape skins and seeds, and their concentration is closely linked to the grape's skin thickness. Cabernet Sauvignon is renowned for its robust and full-bodied character, which is largely attributed to its thick skins that harbor a greater amount of tannins compared to varieties with thinner skins.

This characteristic makes Cabernet Sauvignon particularly suitable for aging, as the tannins contribute to the structure and longevity of the wine, allowing it to evolve beautifully over time. In contrast, while fruit ripeness, wine aging, and soil type all play roles in the overall profile of the wine—such as flavor, aroma, and complexity—they do not directly influence the inherent tannin levels in the same way that grape skin thickness does.