For years, Coppertone Sport SPF 30 lotion was my go-to on account of its effectiveness in sunburn prevention, its non-greasy consistency, and its resistance to both water and sweat. Now, Coppertone Sport doesn't smell as nice Hawaiin Tropic or Banana Boat—which does not, I testify, taste like bananas. But the the stuff in the ubiquitous blue bottle has all the performance characteristics a racing sailor could want. Coppertone doesn't market its Sport line as organic or ocean-safe, which could be considered a strike against. On the other hand, I recently tried an all-natural, zinc-based formula, and it didn't work very well. If anyone knows of a good, eco-friendly, high-performance sunblock, I'd love to hear about it in the comments section below.