When people think about sun damage, they think about burning. But the damage that actually ages your skin is often happening quietly, every single day.
Understanding UVA vs UVB is the difference between basic protection and real skin preservation.
What is UVB?
UVB rays are responsible for sunburn.
They affect the outer layer of the skin (epidermis) and are strongest during peak sunlight hours. This is the UV that leaves your skin red, inflamed, and damaged after direct exposure.
UVB is also closely linked to skin cancer, which is why SPF ratings are based on protection against UVB.
Key takeaway: UVB causes immediate, visible damage.
What is UVA?
UVA rays are the main driver of skin ageing.
They penetrate deeper into the skin, reaching the dermis, where collagen and elastin are produced. This is where long-term structural damage happens.
UVA is responsible for:
- Fine lines and wrinkles
- Loss of firmness
- Pigmentation and uneven tone
- Collagen breakdown
Unlike UVB, UVA is present all year round, even on cloudy days and through windows.
Key takeaway: UVA causes slow, deep, long-term damage.
So what actually matters more for ageing?
If your focus is preventing premature ageing, UVA is the bigger concern.
You don’t need to burn to damage your skin. Daily, low-level UVA exposure leads to:
- Gradual loss of collagen
- Dullness and uneven skin
- Early wrinkles
This is why consistent exposure, even in Ireland, adds up over time.
Why SPF alone isn’t enough
SPF only tells you how well a product protects against UVB (burning).
It does not clearly reflect UVA protection, which is where most ageing happens.
That means you can be wearing SPF… and still not be fully protected from the rays causing long-term skin damage.
What to look for instead
To properly protect your skin, you need:
- Broad-spectrum protection (UVA + UVB)
- SPF 50+ for daily use
- Strong UVA coverage, not just high SPF
Some advanced formulations now specify their UVA protection level in nanometres (nm), giving a clearer indication of how far into the UVA spectrum they protect.
Where REFORM Skincare stands
The REFORM Skincare SPF 50+ Antioxidant Sunscreen is formulated to go beyond standard protection.
- Broad-spectrum defence (UVA + UVB)
- UVA protection up to 380nm — one of the highest levels available
- Antioxidants to help neutralise free radical damage
- Glycerin and Jojoba Oil to hydrate and support the skin barrier
This means you’re not just preventing burning, you’re actively protecting the deeper layers of the skin where ageing begins.
The bottom line
- UVB burns your skin
- UVA ages your skin
- You need protection from both
If you’re serious about preventing premature ageing, daily UVA protection isn’t optional, it’s essential.
Because the damage you don’t see today is what shows up on your skin later.
