You know it.... we all know it. It's why we tan better at our favorite swim-spot or while getting our exercise outdoors, when our skin is dewy,moist, or all - out drenched we always get a darker tan faster than when our skin is dry. Dry skin causes your skin to "slough" easy causing your tan to fade quicker. When you tan with a lotion your skin retains its moisture balance, and therefore you tan lasts longer. Increase the results of each tanning session, slow down the natural sloughing process.