What does SPF mean?

SPF stands for Sun Protection Factor, and it measures how well a sunscreen protects your skin from UVB rays – the primary cause of sunburn, cellular damage, and, over time, skin cancer.

UVA vs. UVB: What’s the difference?

The sun emits two main types of ultraviolet rays that affect your skin:

• UVB rays: Reach only the outermost layers of the skin and are responsible for sunburn. Their intensity varies based on time of day, season, and geographic location.
  
• UVA rays: Penetrate deeper into the skin and are constant throughout the year. They pass through clouds and glass, and contribute to premature aging and hyperpigmentation.
  
  

Derm Tip: The SPF number only refers to UVB protection. Always look for products labeled broad spectrum to ensure coverage against both UVA and UVB.

Why should you wear SPF every day?

UV rays are the number one cause of premature skin aging and a key risk factor for skin cancer. Even during winter or cloudy days, UVA rays are still present – and they pass through windows.

Incorporating sunscreen into your daily morning skincare routine is one of the most effective ways to keep your skin healthy, glowing, and youthful.

Dermatological studies show that daily SPF use can slow the appearance of wrinkles and pigmentation by up to 24%.

Check the UV Index Every Morning

A simple yet powerful habit: check the UV index daily, for example:

• In your phone’s weather app (e.g. iPhone Weather, Google Weather)
  
• With dedicated apps like UVLens, UVIMate, or MySuncheck
  
• On official websites like the WHO or national meteorology services
  
  

UV Index scale:

• 0–2: low → SPF still recommended if outdoors
  
• 3–5: moderate → use sun protection, especially at midday
  
• 6–7: high → avoid direct sun, reapply SPF every 2 hours
  
• 8–10: very high → strong protection + sunglasses & hat
  
• 11+: extreme → avoid sun exposure as much as possible
  
  

If the UV index is over 2, wear SPF – even without direct sunlight.

When and How to Apply SPF for Effective Protection

When should you apply SPF?

• Every morning, as the final step in your skincare routine, before makeup.
  
• Even when indoors or briefly outside – UVA rays pass through windows.
  
• If staying outdoors longer, reapply every 2 hours, especially after sweating, swimming, or towel drying.
  
  

How to reapply if you’re wearing makeup?

No need to remove your makeup! Try:

• SPF cushions: Dab gently without disturbing your look
  
• Light SPF sprays: Perfect for on-the-go top-ups
  
  

K-Beauty tip: SPF cushions are a Korean staple for mess-free protection and a fresh finish anytime.

How much should you use?

Most people don’t use enough. Here’s what’s recommended:

• Two fingers (index + middle) for face and neck
  
• Around 30 ml (a shot glass) for the entire body
  
  

Common SPF Myths – Debunked

• “You only need sunscreen in summer”
  False. UVA rays are active all year long.
  
• “Dark skin doesn’t need SPF”
  False. Darker skin can still suffer UV damage and develop skin cancer.
  
• “If I’m indoors, I don’t need SPF”
  False. Glass blocks UVB, but not UVA.
  
• “SPF 50 protects twice as much as SPF 25”
  False. SPF 25 blocks about 96% of UVB, SPF 50 about 98% – the difference is not linear.
  
  

How to Choose the Right SPF for Your Skin

✔ SPF 30 or higher

SPF 30 is great for daily use; go higher for extended sun exposure.

✔ Broad spectrum (UVA + UVB)

Look for “broad spectrum” or UVA circle icons.

✔ The right texture for your skin type

• Oily / acne-prone skin → gel or oil-free fluids
  
• Sensitive skin → physical filters like zinc oxide
  
• Dry / mature skin → richer textures with hydrating ingredients
  
  

SPF in K-Beauty: Prevention & Smart Formulas

Korean skincare places a strong focus on prevention. SPF is a non-negotiable daily step – just like cleansing and moisturizing.

What makes Korean sunscreens special:

• Featherlight textures that feel like skincare
  
• Natural finish, from dewy to matte
  
• Skin-nurturing formulas with niacinamide, centella, hyaluronic acid
  
  

 Not a fan of greasy sunscreen? Try a Korean SPF – it might change your mind.

Conclusion: SPF is Real Skincare

Sunscreen isn’t a seasonal bonus – it’s a foundational skincare step with long-term benefits. The skin you protect today will thank you tomorrow.

Find the Perfect SPF with Our Free AI Skin Analysis

Not sure which SPF suits your skin best? Our AI Skin Assistant analyzes your skin type, goals, and 3 photos to deliver a personalized routine, including your ideal sunscreen.

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