Firstly, what I didn’t realise, is that the SPF of a sun lotion, only indicates the level of protection against the harmful UVB radiation. It does not tell you anything about the protection it offers against the dangerous UVA light. Now, this is news to me. So, in a nutshell, just because a product has a high SPF, it does not guarantee it is offering the same level of protection against the UVA rays (this encompasses premature ageing)