Adults typically grow to 1.1–1.4 m (3 ft 7 in–4 ft 7 in) in length[1] with a body mass from 63 to 70 kg (139 to 154 lb).[3] The maximum reported size is 1.65 m (5 ft 5 in) in length and 130 kg (290 lb) in weight.[4] There are significant annual variations in the weight, with lowest weight in the spring and highest weight, about 38–42% more, in the fall.[5] The animals show very little sexual dimorphism; males are only slightly larger than females.[3] They have a uniform, steely-grey coat on their backs and fur with a yellowish tinge on their abdomens. As the coat weathers, it becomes brownish.[5] When born, the pups weigh 3–3.5 kg (6.6–7.7 lb) and are about 70 cm (2 ft 4 in) long.[1] They have coats of white, silky, natal fur. This fur is quickly shed and exchanged for a darker coat, much like that of adults.