The overall colour of the soft wooly coat is ochre, light cinnamon, or reddish brown, with the underparts, insides of the legs, and underside of the head being dirty white. On the chest, at the base of the neck, is a peculiar, pompon-like 'mane' of silky white hairs which may be 20-30 cm / 8-12 inches in length. The vicuña is extremely slender, with long skinny limbs and neck. The head is small and wedge shaped, with small, triangular ears. Unique among living even toed-ungulates, the incisors of the vicuña are constantly growing, with enamel on only one side, to keep up with the wear caused by the tough grasses on which they feed.