Thought SPF was just for the summer? Think again. Protecting your skin from the winter sun is just as important as it is during the warmer months. What you want is an SPF that won't melt down your face from the first sign of sweat. Enter La Roche-Posay Anthelios Anti Shine SPF 50+ (£18). Broad spectrum (so it protects against UVA and UVB rays), the waterproof formula can handle rain, snow, and all the sweat you can throw at it.