The Selangor silvered langur has a gray body with a black face and black feet and hands. The type specimen had a head and body length of 50.6 centimetres (19.9 in) and a tail that was 70.4 centimetres (27.7 in) long. The closely related silvery lutung has an average head and body length of 48.9 centimetres (19.3 in) for females and 54.4 centimetres (21.4 in) for males. The silvery lutung has an average weight of 5.7 kilograms (13 lb) for females and 6.6 kilograms (15 lb) for males. The Selangor silvered langur differs from the silvery lutung in the shape of its whiskers. The Selangor silvered langur has long, straight whiskers while the silvery lutung has mussel-shaped whiskers. The two species also differ genetically.
Infants are born with a very different color pattern than the adults. They have bright orange fur with white faces, hands and feet. The infant coloration transforms to the adult coloration over its first 3 to 5 months, starting with the head, hands and feet. All members of the group participate in the care of the infants, including females other than the mother and the dominant male. One theory for the reason for the orange infant coloration is that it may attract other females to help look after the infant.
This langur's distribution is restricted to the west coast of Peninsular Malaysia in Johor, Negeri Sembilan, Selangor, Melaka, Perak and Kedah. It is arboreal and prefers mangrove and riparian forests, but is also sometimes found on plantations. It eats mostly leaves, but also fruit, seeds, flowers and even dried wood. At Bukit Melawati, feeding the Selangor silvered langurs is a popular tourist activity. The Selangor silvered langurs at Bukit Malawati are among the few wild leaf monkey populations to have experienced continual habituation to humans. They will sometimes willingly touch and climb on visitors, in addition to approaching to beg for food. This species was previously lumped with T. cristatus.
