Sol+3 is a newer formulation and can be used alone while sun exposed. It uses different and more powerful antioxidants than AGR+E and also combines UVA and UVB filters. It's a one-step process, you don't have to apply sunscreen after. We found that having only one product makes it easier to comply with frequent applications, a key factor for our products to be effective. It is also more off-white/pale yellow than pure yellow, as the original AGR+E lotion. Unless you swim all day, Sol+3 is a great option and easier to use. The downside is that is it not waterproof. If you plan to spend a lot of time in the water, it's best to go with AGR+E lotion and a fully waterproof sunscreen on top. So far people who used our original AGR+E lotion had great success with the new Sol+3 formulation as well. A great solution is using Sol+3 in the daytime while sun-exposed and AGR+E Intensive Night Lotion at night. This way you are covered with 5 different types of antioxidants, including alpha-glucosylrutin that made the success of the original AGR+E formulation. AGR+E plus your favorite sunscreen and AGR+E Intensive Night Lotion at night is the option to go with if you plan to spend a lot of time in the water or if you have a specific sunscreen you prefer to use, like a mineral sunscreen with zinc for example, or a facial sunscreen using less comedogenic ingredients. With this option, you use AGR+E while sun-exposed, massage well, and then apply your sunscreen on top. It's a two steps process. Both options are equally good, it depends on your daily activities and sunscreen personal preferences.