Sun protection when snorkelling

Some advice about sun protection when snorkelling:

Snorkelling involves swimming at the surface to view the seabed with a mask, a snorkel and some fins.
While snorkelling, exposure to UV rays is relatively strong and this may be accentuated by the following effects:
 
- The first hazard is the magnifying glass effect of the fine layer of water covering your back when snorkelling that can considerably increase the power of the UV light.
It is important to note that UV rays from the sun remain active in water up to 25 cm deep. Snorkellers are therefore exposed for most of the time they are in the water, mainly on the back, shoulders and the back of the thighs.

- The other hazard may come from the cooling of the body by water that prevents the snorkeller from feeling the heat of the UV light. .We are therefore less aware of the sun and, without effective protection, this will cause sunburn...

It is therefore essential to protect the shoulders and the back; to do this, the most effective protection is to wear a UV-protective rash vest, a neoprene top or a neoprene shorty (in addition to the thermal properties of neoprene, it also blocks UV rays).
A waterproof sun cream provides good complementary protection, but take care to apply the sun cream regularly as it tends to disperse more quickly in water.