As a natural blonde with finer hair, I find myself searching for effective methods of protecting my scalp from the harsh sun during the summer months. One of the best products I've tried is the Arbonne To The Rescue Hair Protectant spray.
This product is great for hair that's been exposed to sun, wind, chlorine, or ocean water. The spray conditions and detangles hair while keeping it healthy.
Because your hair is considered "dead protein" the FDA will not allow companies to market hair care products that advertise they contain SPF. The products are allowed to have them, as this one supposedly does, but the FDA says you can't protect something that is not alive already.
In my humble opinion, this product does a wonderful job of protecting one's head and scalp from the sun. This is worth trying if you're looking for the same!