Sunlight generates warmth (infra-red) that we can feel, visible light (that our eyes can see in daylight) and ultraviolet light (UVL) which we cannot see or feel but which can penetrate our skin. The UVL that reaches the earth is grouped into shorter UVB and longer UVA wavelengths. Our skin makes Vitamin D from small amounts of UVB but larger amounts may cause sunburn and contribute to skin cancers. UVA penetrates deeper and large or prolonged exposure may also cause burning, premature skin ageing and skin cancers. Both UVA and UVB suppress skin immune function. For these reasons it is strongly recommended that sun protection plays an important role throughout our lifetime.