Sun protection: get the facts

There is a lot of misinterpretation regarding Sun Protection Factors, such as how they work and what to look for when selecting a product, so let’s look at the facts.

What does the SPF number represent?

The SPF number indicates the percentage of UVB rays (burning rays) that are blocked. Unless the packaging states UVB & UVA (rays that cause aging) Broad Spectrum protection, the SPF refers only to the percentage of UVB rays that are blocked.

Many believe that the higher the SPF number, the longer they can remain in the sun without a reapplication. Although the higher number does provide more protection, it does not provide an increased timeline for safe sun exposure. All SPF products need to be reapplied, approximately every 2 hours, to be effective.

The SPF number indicates the percentage of the sun’s rays that are filtered. You would think that the protection would increase exponentially, however, this is not the case. The protection almost plateaus with a very minimal increase after an SPF of 15, however, most prefer using an SPF of at least a 30 or higher.


The percentage of UVB rays blocked is as follows:

  • SPF 2 blocks approx. 50%
  • SPF 10 blocks approx. 85%
  • SPF 15 blocks approx. 95%
  • SPF 30 blocks approx. 97%

Unless UVB & UVA Broad Spectrum Protection is stated on the packaging, the SPF only indicates the number of UVB rays that are blocked.

What about UVA rays?

UVA rays (the UltraViolet radiation that causes skin aging) must also be considered for skin safety and premature skin aging. UVA are responsible for premature aging, wrinkles, irreversible DNA damage and malignant melanoma skin cancer.

It is proven that the majority of premature skin aging is caused by sun damage. Therefore, G.M. Collin strongly recommends the use of sun protection to preserve skin health and prevent premature skin aging.


Physical (or mineral) VS. chemical sunscreens

Physical: Titanium Dioxide and Zinc Oxide are physical filters that provide both UVA & UVB protection. These are considered physical filters, as they deflect the sun’s rays and don’t allow them to penetrate the epidermis.

Chemical: Oxybenzone, Homosalate, Octisalate, and Avobenzone are chemical filters that absorb the sun’s rays, preventing them from penetrating and damaging the skin. Chemical filters are often unsuitable for sensitive skin. Heat is produced by a chemical reaction on the skin, as the chemical filters absorb the rays, which may cause discomfort and rashes for some. Although chemical filters are suspected of being a health risk, as they do penetrate the skin, to date, there is no evidence confirming that this is true.

Unlike with physical filters, when sun protection products contain chemical filters, they must contain a combination of filters, as no single chemical filter can filter both UVA and UVB rays.




  • Contains non-mineral actives like oxybenzone, octinoxate and avobenzone
  • Designed to absorb and dissipate UVA / UVB rays
  • Should be applied 30 min before sun exposure



  • Contains only mineral actives like zinc oxide and titanium dioxide
  • Designed to reflect and scatter UVA / UVB rays
  • Protects immediately after applying



Enriched with soothing and nourishing ingredients, this broad-spectrum, 100% mineral filter urban sunscreen:

  • Is formulated for daily use
  • Is non-greasy, ultra fluid and leaves an invisible veil
  • Protects against UVA and UVB rays

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Enriched with vitamin E and 4 nourishing, natural oils (sesame, rapeseed, coconut and karanja), this 100% mineral filter sunscreen:

  • Protects against UVA-UVB rays and chemical filter intolerances
  • Leaves a lightweight, invisible veil
  • Provides an ocean-friendly and reef-safe solution

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To conclude, a sun protection product should be applied daily. When spending time outdoors, it is recommended to reapply your SPF every 2 hours to ensure maximum protection.

It is also recommended to also wear protective clothing and to avoid the sun between 10 am and 3 pm when it is the strongest.