Another tubing mascara, the Hourglass Cosmetics Unlocked Extension Mascara (£29) is not only one of our favourite formulas all year round, but it also comes recommended by Barnes as a mascara she likes to break out during the hot summer months. Our favourite thing about it? The formula's ability to give extension-like length with a single coat without making lashes crisp or clumpy. But what makes this great for summer is the fact that A) it feels weightless on your lashes, and B) the formula will only come off when you want to take it off — which you can do with a bit of warm water.