SPF stands for Sun Protection Factor and represents the sunscreen's ability to protect your skin from the sun's rays in addition to your skin's natural protection. Depending on your skin type, hair colour, eye colour and location, you may be able to stay in the sun for 10 minutes without burning.
If you apply a sunscreen with SPF30 this means that you can stay in the sun 30 times longer than you could without sunscreen. However, you must use sunscreen as directed and ensure enough sunscreen is initially applied (35ml) for maximum coverage. Higher factors should not be used to increase your time in the sun, but to increase your level of protection.

There are two types of ultraviolet radiation which can harm our skin – UVA and UVB. Only UVB causes burning, but both types damage our skin, so good sunscreens should protect against both. However, SPF only measures UVB protection, so you have to check to make sure your sunscreen offers UVA protection too. There are lots of different UVA measuring systems around the world. We use the European standard – look for the letters UVA inside a circle. This symbol means that a product meets the EU-recommended level of UVA protection.

Calypso SPF products meet all UVA and UVB standards and are rigorously tested to ensure their effectiveness. The star rating system was designed by Boots (retailer) and is not recognised as industry standard, nor is it regulated.

The letters "UVA" inside a circle is a European industry standard marking, which is contained on all Calypso products. 

Yes you can. All ingredients in the Calypso product range have been approved as cosmetic ingredients.