"The salt in sweat and seawater, plus chemicals in chlorine and sunscreen, can dehydrate skin—so can the aggressive detergent in cleanser used to take off that grimy film every night," says New York City dermatologist Dr. Ellen Marmur. "Skin becomes even more vulnerable as the environment shifts to dryer, cooler weather." Her Rx: Give skin a weeklong break. Wash with a gentle cleanser, and moisturize with emollients like shea butter, natural oils, and ceramides to fortify the skin. "When you improve this lipid barrier and give it a rest from potential irritants [like retinoids, scrubs, or acids], skin can get busy with other duties, like building collagen," says Shamban.
Fresh Seaberry Moisturizing Face Oil, $50.""