Hair needs to be protected from UV rays just as much as our skin does. Especially if you color your hair. I've tried a bunch of products in my quest to find something that will protect my hair from the sun and feels weightless and finally found it with this great Rita Hazan product. In addition to protecting my locks from UV rays, it softens and smooths out frizz.
You can also opt for a hat to protect your strands from the sun. Look for a hat with UPF protection like this one from Coolibar, which blocks 98 percent of UVA and UVB rays from reaching your skin, scalp and hair.