The Scottish Blackface. Tough & adaptable breed is often found in the more exposed locations, such as the Scottish Highlands or roaming on the moors of Dartmoor. Horned in both sexes, a black face sometimes with white markings, and black legs. This breed is primarily raised for meat. Strong Blackface wool undoubtedly makes the best mattress filling there is. Average fibre diameter of 38 to 28 micrometres (or microns), and staple length of 10 to 14 inches (250 to 360 mm).