Friesian The Friesian is most often recognized by its black coat color, though color alone is not its only distinguishing characteristic. A Friesian horse also has a long, thick mane and tail, often wavy, and "feathers" long, silky hair on the lower legs, deliberately left untrimmed. Though very rare white and chestnut Friesians do exist. The frame dimensions are 8" x 16" and 1" deep.. About Mat Options All Mats are acid free and this work includes the mat of your choice. See the pictures above to select your mat. Your piece will be painted to best match your mat. About Frame Options Matted Only Just the acid free mats - No Frame. Black Frames are 1" frames are matte black anodized aluminum frames.