What are cirruscirrostratus and cirrocumulus clouds made of?

Cirrus, cirrostratus, and cirrocumulus clouds are all composed of ice crystals, as they form at high altitudes where temperatures are typically below freezing. Cirrus clouds are thin and wispy, cirrostratus clouds create a veil-like layer over the sky, and cirrocumulus clouds appear as small, white patches resembling ripples or waves. These cloud types generally indicate fair weather but can also signal that a change in weather is approaching.