focale

thumb|upright=1.3|Focalia worn by cavalry troopers and some infantry on a panel from Trajan's Columnthumb|Focale on a Classical reenactment|Roman military reenactor The focale (plural focalia), also known as a sudarium ("sweat cloth"), was a woolen or linen scarf worn by ancient Roman military personnel. It protected the neck from chafing by the armor and was used for warmth. The focale is depicted widely in military scenes from Roman art, such as the relief sculpture on the Arch of Septimius Severus in the Roman Forum and Trajan's Column. It is shown loosely knotted in the front, but is sometimes visible with the ends tucked inside the cuirass.

In Latin literature, focale is a general word for a scarf or wrapping for the throat. A focale was one of the gifts that might be given for the December festival of Saturnalia, according to Martial. In one of his satires, Horace lists focalia among the "badges of illness" (insignia morbi). In describing the correct attire for public speaking, Quintilian advises against wearing a focale, unless required by poor health.