The Cabernet/Merlot glass is perfect for full-bodied, complex red wines that are high in tannin. The generous size of this glass allows the bouquet to develop fully, and smooths out the rough edges. It emphasizes the fruit, playing down the bitter qualities of the tannin, and allows wines to achieve balance. The optic impact in the RIEDEL Performance series adds both a design feature and an astounding effect on wine's aromatics.