La Roche Posay has just launched its second annual SOS (Save Our Skin) campaign which aims to educate people about the dangers of UV exposure. Part pf this year’s is a nifty free iPhone app called My UV Check. The app uses local services to assess the strength of UVA and UVB rays; these skin to age and from cancerous cells, and burn, respectively. If you struggle to know when you should be applying sun cream then try it out!