SPF Doesn’t Work the Way You Might Think

The sunscreen industry, as a whole, has not done the best job of educating consumers about the Sun Protection Factor (SPF) in sunscreen. Most people assume that a higher SPF means dramatically better protection. The truth? The difference between SPF 30, 50, and even 100 is smaller than you’d expect—and how you apply it matters far more than spending more on the highest SPF.

The Real Difference Between SPF Levels

SPF 30

Blocks about 97% of UVB rays—Strong everyday protection

SPF 50

Blocks about 98% of UVB rays—A slight increase, not a jump

SPF 100

Blocks about 99%—Minimal gain for a much higher number

As you can see, there's just a 1–2% difference between SPF 30 and SPF 100!

What you can expect from a lotion -vs- a spray

Lotions

  • Even, controlled coverage
  • Better for full-body application
  • Ideal for longer exposure

Sprays

  • Fast and convenient
  • Easy to apply on the go
  • Best when rubbed in for full coverage

Here's the bottom line—SPF only works as well as it’s applied.

Real Protection Comes From Good Habits

Reapply

Reapply every 2 hours—and immediately after swimming, sweating, or towel drying—to maintain effective protection throughout the day.

Apply Enough

Most people don’t use enough sunscreen. Use about a shot-glass amount for full-body coverage to achieve the SPF protection listed on the label.

Cover Up

Add extra protection with wide-brimmed hats, UV-blocking sunglasses, and protective clothing—especially during peak sun hours.

Broad Spectrum

Choose a broad-spectrum sunscreen that protects against both UVA (aging) and UVB (burning) rays for more complete skin protection.