It is mainly yellow in color but some have a suggestion of slight green. They are classified as semi-sparkling wines and have a slightly biting or prickling quality and a refreshing twang. The vines are kept clear of the ground by being draped on trees or specially-constructed trellises. This serves a double purpose; firstly by freeing the land beneath for cultivation and, secondly, by protecting the vine against damp and parasitic rot. These wines have a lower alcohol content.