Why are you into it?
Worth the hype, but only if you do it right.
About
Most sunscreen burns your eyes. The formulas sting, the ingredients migrate, and you spend summer squinting through chemical tears. But a few brands figured out the chemistry. EltaMD UV Clear uses zinc oxide and niacinamide instead of the usual suspects. La Roche-Posay Anthelios Ultra Light stays put once it sets. Supergoop! Unseen Sunscreen disappears completely, no white cast, no migration.
The secret is particle size and vehicle. Mineral sunscreens work when the zinc oxide particles are nano-sized but not so small they penetrate skin. Chemical sunscreens work when they're formulated to polymerize on contact, creating a film that doesn't budge. Dermatologists at Mount Sinai have been testing formulas for decades. The ones that pass clinical trials for eye irritation cost more, but the math is simple: you'll actually wear them.
Application matters more than SPF number. Most people use a quarter of the recommended amount. You need a full teaspoon for your face, applied twenty minutes before exposure, reapplied every two hours. The American Academy of Dermatology publishes the real numbers. SPF 30 blocks 97% of rays. SPF 50 blocks 98%. The difference between religious application and casual dabbing is everything.
Worth the hype, but only if you commit to the routine. Half-hearted sunscreen application is worse than none. You think you're protected, so you stay out longer. The burn comes anyway.
Fun fact
Zinc oxide was first used as sunscreen by lifeguards in the 1930s, applied as thick white paste that made them look like war paint.