"10 Ways to Winter-Proof Your Skin. Fight the elements and avoid a dry, dull complexion with these top tips. Pick a super serum... 

'The simplest way to explain the difference between a serum and a moisturiser is that moisturisers operate more on the surface layers on the skin, whereas serums penetrate further, delivering nutrients to the deepest layers of the skin', says Anna Brightman, co-founder of UpCircle. 'Serums leave out ingredients such as mineral oils that moisturisers often use to keep water from evaporating from the skin - they "lock in" the moisture. Serums don't need these because they operate in the deeper levels. It is because of this that some people, particularly those with very dry skin, choose to use a serum first followed by a moisturiser, as the moisturiser will help to seal in the actives and nutrients of a serum."