This decoder separates common sunscreen label terms so readers can understand what each claim actually means.

Label decoder

Label term	What it tells you	What it does not tell you
SPF	A standardized measure focused on UVB-related sunburn protection under test conditions.	It does not by itself describe the full UVA protection profile.
Broad Spectrum	In the U.S., indicates the product meets FDA broad-spectrum testing requirements.	It does not mean unlimited protection or no need to reapply.
Water Resistant 40/80 minutes	The product met testing for the stated period while swimming or sweating.	It does not mean waterproof.
Directions	Product-specific application and reapplication instructions.	They should not be replaced by a generic internet rule.

• For swimming or heavy sweating, look for a water-resistance statement.
• Read the product directions, not only the SPF number.