Hot Summer sun WILL wreck your color investment. The sun will dry out your locks, which will dull your color & lead to your color fading quickly . Color oxidation occures naturally in the sun ruining your haircolor. Neither will leave you happy with your hair. The best protection is a wide brimmed hat with SPF fabric. If that's not an option consider a scarf or headwrap. If that's not your thing, absolutely buy a professional product with sunblock already in the product. A fave is Paul Mitchell's Sun Collection line. And No, Sunscreen for your skin is not effective for your hair, your scalp yes, hair no! Summary... Buy a cute hat!