The rule of thumb is to wear a broad-spectrum SPF of at least 30 every single day. A raspberry-sized amount should be applied to your face and a shot-glass amount to the rest of your body. Reapplication should occur every two hours when outside, and every four hours when inside, as well as anytime you get out of the pool/water or have been sweating.

Reapplication — especially over makeup — might seem an annoying task. There are a handful of products that'll make your life easier, though. For example, Acwell's UV Cut SPF 50+PA++++ Natural Sun Cushion, $35, comes in a handy compact and goes on invisible over your makeup.

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SPF is necessary whenever you're exposed to the sun. What you may not realize, however, is that you're exposed almost constantly.

"This includes walking to work, being inside your car, [or sitting in a room with a window]. UV-A rays, which cause both skin cancer and premature aging, can pass through glass windows," says Dr. Brian Ginsberg, a board-certified dermatologist and assistant professor at Mount Sinai Hospital. "Also, don't be fooled by a cloudy or snowy day. Clouds can let through up to 80 percent of the UV light, and snow reflects it, which actually increases your need for protection."

SPF should be applied anywhere that's exposed, including your face, chest, hands, ears, tops of your feet, and even your scalp. Sun Bum's Scalp & Hair Mist SPF 30, $14.99, has you covered — literally — on that last one!

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Speaking of scalp sunscreen... there are many different SPF formulations available ranging from oils to creams to serums to powders. They all fall into two primary categories though: mineral/physical and chemical. Let's talk about the former.

The former utilizes ingredients such as zinc oxide and titanium dioxide which essentially reflect the sun's rays. For example, Versed's new Guards Up Daily Mineral Sunscreen Broad Spectrum SPF 35, $21.99, utilizes non-nano zinc oxide to protect skin. It's also formulated with pollution fighting moringa seed extract and sea fennel to help block blue light damage.

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Chemical sunscreens are absorbed by the skin and then convert UV energy into a different form of energy. Chemical sunscreens must be applied 15 minutes before exposure (and before getting wet) in order for the product to absorb completely and be able to work its magic.

Neutrogena Ultra Sheer Lightweight Sunscreen Spray SPF 100+, $8.99, is a winner. It applies evenly, dries quickly, and is never sticky. The fact that it's a spray also makes it a bit easier to apply to yourself if you're running solo on the beach or at the pool.

Some find that chemical sunscreens have superior formulations that glide on easily, are less chalky/thick, and make for a more foolproof application. Others prefer physical/mineral-based sunscreens because they are deemed safer for skin and reefs. What type of sunscreen you choose is a matter of preference; the most important factor to consider is whether it's a formulation you'll want to wear every single day.

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