Skin gets damaged by the sun, cold winds and gets dry from central heating & air conditioning. As we get older our skin becomes more dry and wrinkly. An effective moisturiser contains long lasting humectants that attract water and keep it in the skin.
It should also contain emollients and are blended with oils and emulsified into a cream, which acts as a barrier against external irritants. Moisturisers with added sun protection also prevent further sun damage.