Broad spectrum is non-negotiable.

It means the sunscreen protects against both UVA and UVB rays, and you absolutely want that.

SPF only tells you how well a sunscreen blocks UVB rays — the ones that cause sunburn. UVA rays are the ones that cause premature aging and skin cancer, but they don’t usually burn you, so you might not notice them. Broad spectrum means the sunscreen has been tested to also block UVA rays.

Most sunscreens sold in the US before the FDA required broad spectrum testing were UVB-only. Don’t buy a sunscreen without the “broad spectrum” label — you’re basically paying to get burned slower while still getting the damage you can’t see.

Your future skin will thank you.