Cirrus fibratus, also called Cirrus filosus, [2] is a type of cirrus cloud.

The name cirrus fibratus is derived from Latin, meaning "fibrous".

[3] These clouds are similar to cirrus uncinus, commonly known as "mares' tails," yet different in that fibratus clouds do not have tufts or hooks at the end.

[5] Like other cirrus clouds, cirrus fibratus occurs at high altitudes.

They can indicate an approaching warm front[6] and can also be an indication that fair weather will follow.