If there's one mask always present on Instagram shelfies, it's the Summer Fridays Jet Lag Mask (£22.50). If dewy, hydrated skin is what you're after, here it is, housed in a cute blue tube. Packed full of vitamin C, niacinamide, chestnut extract, and green tea extract, this formula simultaneously hydrates while minimising the appearance of pores and blemishes. Our favourite way to use it is layered over our nightly serum (and even over our regular face cream if our skin is exceptionally dry) to really lock in all of the moisture and hardworking ingredients.