The difference between UVA and UVB rays comes down to wavelength and how deeply they reach the skin. UVA rays have a longer wavelength, penetrate deep into the dermis and are the primary cause of photoageing and wrinkles, being present throughout the year. UVB rays have a shorter wavelength, affect the upper layer of the skin and cause sunburn. That is why skin needs broad-spectrum protection against both types, as provided by InaEssentials SPF 50+ natural sunscreen.
What are UV rays?
The sun emits light across a broad spectrum, a portion of which consists of invisible ultraviolet rays. These are divided into three groups according to wavelength: UVA, UVB and UVC. UVC rays are absorbed by the ozone layer and never reach the Earth's surface, so only the first two types are relevant for the skin.
Both UVA rays and UVB rays reach the Earth's surface and affect the skin in different ways. To understand why proper protection is so important, it is worth looking at what each type actually does.
What are UVA rays?
UVA rays have a longer wavelength (approximately 320–400 nm) and make up the largest portion of the ultraviolet radiation that reaches the skin. They are often called the ageing rays, because their effect accumulates silently, without any visible redness.
- Penetrate deep into the dermis, reaching the collagen and elastin layers.
- Present at a near-constant intensity throughout the year, even on overcast days.
- Pass through window glass and car windscreens.
- Contribute to photoageing, wrinkles and uneven pigmentation.
What are UVB rays?
UVB rays have a shorter wavelength (approximately 280–320 nm) and carry more energy. Their effect is more visible and faster: they are the reason the skin turns red and burns after too long in the sun.
- Mainly affect the upper layer of the skin, the epidermis.
- Strongest in summer and during the hours around midday.
- The principal cause of sunburn.
- Largely blocked by ordinary glass.
What is the difference between UVA and UVB rays?
In short, the difference between UVA and UVB rays lies in wavelength, depth of penetration and the effect on the skin. A useful way to remember them: UVA for Ageing, and UVB for Burning.
Both types of rays affect the skin over time, so it is not enough to protect yourself only against burns. True care means protection against both UVA rays and UVB rays simultaneously, meaning broad-spectrum sun protection.
How do UVA and UVB rays penetrate the skin?
The depth to which rays penetrate explains why their effects are so different. The longer the wavelength, the deeper the radiation reaches into the skin.
UVB rays stop mainly in the epidermis, the upper layer of the skin, and that is why they cause surface burns and redness. UVA rays penetrate deeper, into the dermis where collagen and elastin are found, and that is precisely why they contribute to long-term photoageing.
How do we protect ourselves from UVA and UVB rays?
The key is broad-spectrum protection. A good sunscreen must block both types of rays simultaneously, not just prevent burns. For everyday use and for the beach, the most practical approach is a high SPF 50+ factor that is easy to apply and reapply regularly.
A ready-made solution is the Natural Sunscreen for Face and Body SPF 50+ with Organic White Fir from InaEssentials. It combines transparent zinc oxide and 100% organic dry oils for high protection against UVA and UVB rays, in a practical 100 ml pump bottle.
A mineral filter that reflects both UVA and UVB rays right at the skin's surface, without leaving white residue.
White fir plant oil soothes the skin and supports its natural protective functions during daily sun exposure.
100% organic dry oils provide a light, fast-absorbing texture with no greasy feel, making frequent reapplication comfortable.
Family Pack for Sun Protection
Get 2 + 1 free of the SPF 50+ sunscreen and secure broad-spectrum protection for the whole family at a better price.
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“The product is colorless, there's no white cream residue that makes it look like you've spilled a cup of yogurt.”
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About InaEssentials
InaEssentials is a family-run natural cosmetics brand, created with care for the skin and for nature. Products are developed with clean, organic ingredients and without unnecessary chemicals.
That is why the sunscreen is formulated to gently care for the whole family, from the youngest to adults, with the same attention the brand brings to every one of its products.
Frequently asked questions about UVA and UVB rays
Sources and important information
- InaEssentials - product page and ingredient list for the Natural Sunscreen for Face and Body SPF 50+ with Organic White Fir.
- General information about the UVA/UVB spectrum and depth of penetration according to wavelength.
The information in this article is for educational purposes only and does not replace medical advice. The product is a cosmetic and is not a medicine. In the case of a skin condition or any doubt, please consult a dermatologist. Results may vary between individuals.
