The design of the glassware used when tasting wines is not arbitrary. Its tulip-like shape helps to trap wine odors. Optimal wine tasting glassware will be thin so that the heat of a taster’s hand can warm it if necessary, and clear in order to accurately show wine color.
It should also be large enough to swirl/splash a 2 oz. serving. Standard ISO glass is 6.5 oz., however 8-10 oz. glasses are also acceptable.