You'll want to apply your sunscreen as the last step in your skin care routine, but before you apply makeup. You should always put on sunscreen after your moisturizer. Apply your moisturizer, then wait for it to sink in. Once your moisturizer has dried, you can go ahead and apply a generous amount of sunscreen. You should then wait for it to settle before going outside or putting on any makeup. That allows the sunscreen to absorb properly into your skin so the product provides the best possible protection. If you're looking for a way to simplify your routine, you can even find moisturizers and cosmetics that include sun protection among their benefits. These products allow you to cut out a step or two, without sacrificing the important protection factor sunscreens provide.