What is SPF?

SPF stands for Sun Protection Factor, and it’s a measure of how well a sunscreen protects your skin from UVB rays, the kind of radiation that causes sunburn and can contribute to skin cancer. SPF does not measure protection from UVA rays (which cause skin aging), so look for broad-spectrum products for full coverage.

What Do the Numbers Mean?

The number next to SPF (like SPF 30 or SPF 50) indicates how long the sun’s UVB rays would take to redden your skin if you applied the sunscreen properly compared to if you weren’t wearing any at all.

For example:

• SPF 15 blocks ~93% of UVB rays
  
  

• SPF 30 blocks ~97%
  
  

• SPF 50 blocks ~98%
  
  

• SPF 100 blocks ~99%
  
  

Higher numbers do not last longer—they just provide slightly better protection. No sunscreen blocks 100% of UVB rays.

What’s the Best Sunscreen for Your Skin Type?

Choosing the right formula makes a big difference:

• Oily or acne-prone skin: Use gel-based or oil-free sunscreen, preferably non-comedogenic.
  
  

• Dry skin: Look for hydrating cream sunscreens with ingredients like hyaluronic acid or ceramides.
  
  

• Sensitive skin: Go for mineral sunscreens with zinc oxide or titanium dioxide—they’re gentler and less likely to cause irritation.
  
  

• Dark skin: Use clear or non-white cast formulas to avoid residue. Many brands now make tinted mineral sunscreens suitable for deeper tones.
  
  

How Long Does Sunscreen Last (and Other FAQs)

• How often should I reapply? Every 2 hours, or immediately after swimming or sweating.
  
  

• Do I need it indoors? If you’re near windows or using screens all day, yes—UVA rays can still reach you.
  
  

• Is sunscreen safe for kids? Yes! Choose mineral sunscreens for infants and toddlers.
  
  

• Can I skip it on cloudy days? No—up to 80% of UV rays can penetrate clouds.
  
  

Bottom Line:

Daily sunscreen use is a skincare essential, not just a beach day accessory. Choose the right SPF for your lifestyle, reapply often, and protect your skin from premature aging and sun damage.

What is SPF?

SPF stands for Sun Protection Factor, and it’s a measure of how well a sunscreen protects your skin from UVB rays, the kind of radiation that causes sunburn and can contribute to skin cancer. SPF does not measure protection from UVA rays (which cause skin aging), so look for broad-spectrum products for full coverage.

What Do the Numbers Mean?

The number next to SPF (like SPF 30 or SPF 50) indicates how long the sun’s UVB rays would take to redden your skin if you applied the sunscreen properly compared to if you weren’t wearing any at all.

For example:

• SPF 15 blocks ~93% of UVB rays
  
  

• SPF 30 blocks ~97%
  
  

• SPF 50 blocks ~98%
  
  

• SPF 100 blocks ~99%
  
  

Higher numbers do not last longer—they just provide slightly better protection. No sunscreen blocks 100% of UVB rays.

What’s the Best Sunscreen for Your Skin Type?

Choosing the right formula makes a big difference:

• Oily or acne-prone skin: Use gel-based or oil-free sunscreen, preferably non-comedogenic.
  
  

• Dry skin: Look for hydrating cream sunscreens with ingredients like hyaluronic acid or ceramides.
  
  

• Sensitive skin: Go for mineral sunscreens with zinc oxide or titanium dioxide—they’re gentler and less likely to cause irritation.
  
  

• Dark skin: Use clear or non-white cast formulas to avoid residue. Many brands now make tinted mineral sunscreens suitable for deeper tones.
  
  

How Long Does Sunscreen Last (and Other FAQs)

• How often should I reapply? Every 2 hours, or immediately after swimming or sweating.
  
  

• Do I need it indoors? If you’re near windows or using screens all day, yes—UVA rays can still reach you.
  
  

• Is sunscreen safe for kids? Yes! Choose mineral sunscreens for infants and toddlers.
  
  

• Can I skip it on cloudy days? No—up to 80% of UV rays can penetrate clouds.
  
  

Bottom Line:

Daily sunscreen use is a skincare essential, not just a beach day accessory. Choose the right SPF for your lifestyle, reapply often, and protect your skin from premature aging and sun damage.