Sun Advice

We enjoy being outdoors during the summer. The sun gives us a feeling of general wellbeing and we associate a tan with looking healthy. But to have an active outdoor life we need to be careful and follow these important guidelines:

  • Stay out of the sun between the hours of 11am and 3pm when the intensity of the sun's rays is greatest. It is therefore important to avoid midday sun. Do not stay in the sun too long even when protected. Over exposure to the sun is a serious health threat.
  • Take into account the strength of the sun and don't expose yourself to it for longer than your skin type allows.
  • Do not stay in the sun too long even when using a once a day sun protection product.
  • Keep babies and young children out of direct sunlight.
  • Do not apply P20 to broken or sunburnt skin. If you have already been burnt, make sure you stay out of the sun.
  • Keep yourself well covered with light clothing, such as a t-shirt and wear sunglasses and a wide-brimmed hat.
  • Apply P20 generously and evenly. Always remember to apply enough sunscreen to achieve the protection stated on the product. The average adult needs to apply 30-40ml of sun cream for a full body coverage and effective protection. Pay particular attention to the back of the neck, the upper part of the chest, backs of the legs, shins, shoulders, nose and ears. Always apply 15 minutes before sun exposure. If you apply less sunscreen, the sun protection factor and protection will decrease significantly.



Simply match your skin type with your location or holiday destination to find out which factors are right for you and your family. 

NOTE: This is a general guideline as everyone's skin is different. Use common sense and avoid over exposure and/or sunburn.


Level of spf

The Sun Protection Factor (SPF) specified on your bottle of sun protection tells you how much protection your product offers against UVB rays and is also an indication of level of protection against erythemal UV, which also includes a bit of UVA. It is measured using a standardised test. In general, the higher the number, the greater the protection, as you can see from the chart.


The SPF number indicates how many times longer you can stay in the sun before starting to burn than you would without sun protection. In other words, the higher the SPF the greater the protection. But remember these are theoretical values. In reality the time depends on other factors such as your skin photo type and the local UV intensity.

To choose the right SPF, you need to consider several factors. The most important of these is your skin's phototype, which includes the colour of your skin before exposure to the sun, your hair and eye colour and other factors. You can check your skin type on our sun advice page. You also need to think about where you are going on holiday and what time of year it is.

Children's skin is more sensitive to the sun and more prone to sun damage so we recommend choosing a higher SPF (at least SPF30 or SPF50) for kids than you would for an adult.

“It’s nice that P20 absorbs quickly into my skin, so I actually do not feel that I have it on” READ MORE

Michael Hestbæk

Michael Hestbæk is a professional yachtsman who has taken part in in four Olympic Games. He has also won over 25 European and World Championships medals. Michael Hestbæk says: "I have not used anything else than P20 sunscreen in recent years because it keeps me protected from the sun for many hours and is highly water resistant, which is important when I'm sailing. It's great that it absorbs quickly, so I actually do not feel that I have it on.


Riemann products are developed scientifically and tested independently. We have specialist knowledge of how the sun affects our skin, ultra violet radiation and the way skin varies from one person to another.



Found in sunlight, ultraviolet (UV) radiation is invisible to the human eye.  



UVA mainly damages the structure of the skin and causes wrinkles, sagging and premature ageing of the skin. UVA penetrates deeper into the skin than the UVB and, like UVB, is known to cause cancer by damaging the DNA of skin cells.


UVB is responsible for the majority of sunburn and plays a key role in developing skin cancer. Traditionally, sun protection products have mainly protected us against UVB rays.


UVC is absorbed into space by the atmosphere and does not reach the Earth's surface.


Each year there are more new cases of skin cancer than the combined incidence of cancers of the breast, prostate, lung and colon. About 90% of non-melanoma skin cancers are associated with exposure to ultraviolet (UV) radiation from the sun.

UVA was thought not to cause any skin damage as there are no visible short-term signs of this radiation. However, it has now been shown that UVA can contribute to skin cancer. We are exposed to UVA rays during the daylight hours throughout the year as they are not blocked by clouds or windows.

That is why it's important to find a sun protection product that protects against UVA as well as UVB.

To protect the skin, sunscreens use UV filters that absorb radiation from the sun. When a sunscreen is exposed to this radiation, it can alter the chemical structure of the UV filters and reduce their protective capabilities.

A "photostable" sunscreen is able to withstand the effects of UV exposure better, so it keeps its level of protection.

Broad spectrum protection means the ability to protect against the harmful effects of both UVA (ageing rays) and UVB (burning rays). To be classified as offering broad spectrum protection, a product needs to absorb or reflect at least 90% of the UV rays from the 290 to 400 nanometres (nm) wavelength range.

The sun's UV rays are reflected by snow, water and sand, thus exposing your skin to higher doses. Snow reflects up to 85%, sand reflects about 17% and water 10% of the sun's UV rays.