Firstly, choose clear glass or crystal.
The stem should be strong.
A red wine glass should be larger than a white glass, with a wide bottom or bowl to allow more aeration. The rim should be narrower than the bowl to direct the aromas and flavours.
Whites should be served in a tulip-shaped glass. The bowl should be narrower than a red to keep the wine cooler and intensify the aromas.
Sparkling wine glasses are narrow and tall and most commonly called flutes. They are thought to keep the bubbles for longer and allow the wine to stay cool.
Glass company Riedel makes glasses for virtually every style and grape variety you could wish for.