Neck and décolletage creams are targeted formulas designed to treat the signs of aging on your neck and décolletage. Yes, you could also use your face moisturizer on your neck to help hydrate, however the skin on the neck is thinner, more delicate and drier, making it more prone to slack, sagging skin, along with lines and wrinkles. Opting for a more powerful, yet gentle cream, packed with firming ingredients is the best way to treat and prevent signs of aging on the neck.