California-based Zinka is credited with creating the first colored zinc oxide sunblock around 25 years ago. The brand's colorful block was an instant hit with surfers, volleyball players and sunbathers alike. Made of 25 percent zinc oxide, it reflects sunlight, blocks out UVA and UVB rays and is water resistant. The best part? In cool colors, it's visible on their skin—so you know what's been covered—and it's sunblock they'll actually want to put on (priceless).