The Science of Sun
I love swimming and snorkeling, but some sunscreens contain ingredients that can harm the coral reef. Not so with MD SolarSciences Ultra-Sportstick SPF 40 ($16), a PABA-free sunblock that kicks away UVA and UVB rays while being incredibly water-resistant. It's especially handy for outdoorsy types, since the packaging is compact enough to take anywhere: on a hike, to a lake, or on a boat.
—Annie Tomlin, Senior Editor