If you’ve ever found yourself squinting at the back of a sunscreen bottle trying to decipher the acronyms and numbers, you’re not alone. While “SPF” is a familiar term for many, the growing use of ratings like “PA+++” has introduced a new layer of complexity for skincare-conscious consumers. What do these ratings mean? Do they both matter? And how can they truly protect your skin from the sun’s harmful effects?
Understanding these labels is essential to protecting your skin health. Whether you’re aiming to prevent premature aging, avoid sunburns, or shield your skin from the effects of daily blue light exposure, knowing the difference between SPF and PA ratings can empower you to make smarter, safer skincare choices.
In this blog, we’ll break down what SPF and PA+++ really mean, how they work together to support your skin, and why choosing the right sun protection is one of the most important steps in your daily routine.
What Is SPF? A Quick Primer
SPF, or Sun Protection Factor, is one of the most common metrics used to measure a sunscreen’s effectiveness. Specifically, it refers to the level of protection a product offers against UVB rays, the type of ultraviolet radiation responsible for causing sunburns and directly damaging the skin’s outer layers.
But what does that number actually mean? Think of SPF as a multiplier: if your skin would normally start to burn after 10 minutes in the sun without protection, an SPF 30 sunscreen theoretically extends that time by 30 times—so up to 300 minutes of protection. However, this isn’t a hard rule. Factors like sweating, swimming, and rubbing your skin can reduce effectiveness, which is why frequent reapplication is key.
Here’s a quick breakdown of SPF levels explained:
- SPF 15 blocks about 93% of UVB rays
- SPF 30 blocks about 97% of UVB rays
- SPF 50 blocks around 98% of UVB rays
It’s important to note that higher SPF doesn’t mean dramatically better protection. The added percentages become marginal, and no sunscreen can block 100% of UV rays. That’s why the American Academy of Dermatology recommends SPF 30 or higher for everyday use—especially when paired with broad-spectrum protection.
What Does PA+++ Mean? Understanding UVA Protection
While SPF tells you how well a sunscreen protects against UVB rays, it doesn’t address another critical threat to your skin: UVA rays. These longer wavelength rays penetrate deeper into the skin and are primarily responsible for premature aging, including fine lines, wrinkles, loss of elasticity, and age spots. This is where the PA rating system comes in.
Originally developed in Japan and widely used in Korean skincare, PA stands for Protection Grade of UVA. It uses a plus system to indicate the strength of UVA protection:
- PA+ = Some UVA protection
- PA++ = Moderate UVA protection
- PA+++ = High UVA protection
- PA++++ = Extremely high UVA protection
So, what does PA+++ mean? It signifies that the product offers high-level defense against UVA rays—ideal for daily use, especially if you’re focused on long-term skin health and protection against photoaging. In modern life, UVA exposure doesn’t just come from the sun; it also includes blue light from digital devices, which studies suggest may contribute to oxidative stress and skin aging over time.
A sunscreen with both SPF and a PA+++ rating ensures your skin is protected from the full spectrum of ultraviolet damage—both the visible, like sunburn, and the invisible, like collagen breakdown.
If you’re using sunscreen daily—and you should be—understanding the PA rating is just as important as checking the SPF. Together, they form a more complete, broad-spectrum shield for your skin.
Why You Need Both: SPF + PA+++ for Broad Spectrum Protection
Choosing a sunscreen isn’t just about picking the highest SPF number on the shelf—it’s about ensuring comprehensive protection. While SPF guards against UVB rays (the ones that burn), it doesn’t necessarily mean you’re protected from UVA rays (the ones that age).
That’s why looking for products labeled as broad spectrum is crucial. Broad spectrum sunscreens are designed to protect against both UVA and UVB rays, delivering a more balanced defense for your skin. However, not all sunscreens clarify how much UVA protection they provide—especially in Western markets where PA ratings aren’t as commonly used.
This is where a PA+++ or PA++++ label adds real value. It confirms that your sunscreen goes beyond basic sunburn prevention to help fight the invisible signs of aging and blue light damage from indoor exposure.
Here’s a simplified way to think about it:
- SPF = Prevents sunburn (short-term damage)
- PA+++ = Prevents skin aging (long-term damage)
If you’re serious about your skincare routine, especially in maintaining a youthful, radiant complexion, both metrics should matter. For modern sun protection, it’s not SPF or PA—it’s SPF and PA+++, working together to help defend your skin from every angle.
Natrience™ Skin Shield SPF 30 Mineral Sunscreen—Smart Protection, Naturally
When it comes to finding a sunscreen that truly supports your skin, Natrience™ Skin Shield SPF 30 Mineral Sunscreen checks every box. Formulated as part of the Natrience™ skin care line, it’s powered by 100% natural mineral zinc oxide and offers broad spectrum + PA+++ protection—meaning it shields your skin from both burning UVB rays and aging UVA rays.
But Natrience™ Skin Shield SPF 30 Mineral Sunscreen goes beyond just sun protection. It’s enriched with clean, skin-loving ingredients like:
- Beet root extract to deeply hydrate and reinforce the skin barrier
- Spirulina maxima to help reduce signs of digital aging caused by blue light
- Red algae and plankton extracts that defend against environmental stressors and pollution
- Prebiotics to support a healthy skin microbiome
Plus, this lightweight, reef-safe formula is non-greasy, tinted for a radiant finish, and features a calming green tea scent—making it the perfect final step in your morning skin care routine.
Unlike many conventional sunscreens, Skin Shield SPF 30 Mineral Sunscreen is created with Sisel’s Sisel Safe® standards, meaning it avoids harmful chemicals and is safe for you and the planet. If you’re looking for a clean, effective, and luxurious daily sunscreen, Skin Shield SPF 30 Mineral Sunscreen isn’t just a product—it’s a full-spectrum solution for radiant, protected skin all year long.
Choosing the Right Sunscreen: Ingredient & Label Tips
Now that you understand the importance of both SPF and PA ratings, how do you choose the right sunscreen? It starts with reading the label—and the ingredients—carefully. Not all sunscreens offer equal protection, and many still rely on outdated formulations that prioritize UVB defense but overlook UVA exposure or skin-friendly ingredients.
Here are some tips to help you choose a sunscreen that truly supports skin health:
- Look for “Broad Spectrum”– This indicates that the sunscreen is designed to protect against both UVA and UVB rays. But since “broad spectrum” isn’t always specific, a PA+++ rating provides added assurance of UVA defense.
- Choose Mineral Actives – Opt for 100% mineral sunscreens with ingredients like zinc oxide, which sits on the skin’s surface and physically blocks UV radiation. These are typically non-toxic, reef-safe, and less likely to cause irritation compared to chemical sunscreens.
- Pay Attention to Skin-Friendly Additives – Look for hydrating and soothing ingredients.
Your skin deserves more than just a number. Choosing a well-formulated sunscreen gives you lasting protection without compromising your health or the planet.
Final Sun Protection Tips for Daily Skin Health
No sunscreen can do it all if it’s not used properly. To make the most of your sun protection and keep your skin healthy year-round, here are a few daily tips:
- Reapply regularly: Sunscreen wears off due to sweat, water, and friction. Reapply every 2 hours when outdoors, and immediately after swimming or sweating.
- Use enough: Most people under-apply. Use a nickel-sized amount for your face and more for exposed areas.
- Wear sunscreen every day—even indoors. UVA rays penetrate windows, and blue light from devices adds up over time.
- Apply as the last step in your morning skincare routine. Mineral sunscreens like Skin Shield can even double as your daytime moisturizer.
Daily sunscreen use isn’t just for summer or beach days—it’s a year-round commitment to keeping your skin radiant, resilient, and protected.
Empowering Better Skin Decisions
Understanding the difference between SPF and PA+++ empowers you to make smarter, more informed decisions about your sun protection routine. While SPF helps guard against sunburn-causing UVB rays, PA ratings tell you how well a product shields your skin from aging UVA rays—both are essential for long-term skin health.
By choosing a broad spectrum sunscreen with both high SPF and a PA+++ or higher rating, you’re not just preventing damage—you’re actively supporting your skin’s vitality, radiance, and resilience. Whether you’re outside and exposed to the sun or spending the day in front of a screen, your skin deserves comprehensive care that works all day, every day.
Frequently Asked Questions
Q: How does Skin Shield Mineral Sunscreen support skin health?
A: According to the American Academy of Dermatology, sunscreen plays a key role in protecting your skin from the unwanted effects of the sun. In addition to helping prevent sunburn, using a broad spectrum sunscreen with SPF 30 or higher can decrease signs of early aging on your skin like wrinkles, age spots, and sagging skin, and reduce your risk of developing skin cancer.
Q: What do UVA and UVB mean?
A: The sun emits light in different wavelengths, some of which are proven to damage the skin, such as ultraviolet A and ultraviolet B. UVA rays penetrate the skin more deeply and can be one of the chief cause of wrinkles, sagging, and premature skin aging. UVB rays are the primary cause of sunburn and damage the skin’s upper surface. An easy way to remember the difference is UVA = Aging rays and UVB = Burning rays.
Q: What does broad spectrum mean?
A: Broad spectrum means that a sunscreen provides effective protection from UVA and UVB rays, both of which can cause unwanted skin conditions, including skin cancer.
Q: What does SPF mean?
A: SPF means Sun Protection Factor and is a rating of a sunscreen’s ability to limit your skin’s exposure to UVB rays. An SPF 15 filters out approximately 93% of UVB rays. An SPF 30 can filter out up to 97% of UVB rays. Above SPF 30 the amount of additional sun protection is negligible. The American Academy of Dermatologists recommends at least SPF 30, which represents high strength UVB protection.
Q: What does PA mean?
A: PA means Protection Grade of UVA. It’s a Japanese scoring system specifically designed to measure a product’s ability to block UVA rays. A PA+++ rating represents high strength UVA protection.
Q: What are the key benefits of Skin Shield SPF 30 Mineral Sunscreen Lotion?
A: Skin Shield SPF 30 Mineral Sunscreen Lotion is formulated to moisturize your skin, support skin’s natural barrier function, and support skin’s healthy microbiome. In addition to its hydrating benefits, Skin Shield also includes active ingredients designed to help protect skin from damaging UVA and UVB rays, from the harmful effects of blue light, and from environmental stressors.
Q: How do I use Skin Shield SPF 30 Mineral Sunscreen in my skin care routine?
A: Skin Shield Mineral Sunscreen is an essential final protective step in your regimen. Apply following your daytime moisturizer, either Hydra Light Repair Lotion or Hydra Light Repair Cream. Alternatively, since Skin Shield is formulated with powerful moisturizing properties, it can be used as your daytime moisturizer.