Not only can primers help condition lashes when not wearing makeup, they also limit mascara fall-out, especially in warm weather. Since I want my eyes to really pop, I'm rounding out my beauty-bag-refreshing list with this Tarte Opening Act Lash Primer ($11) so the white tint brings out the contrasting dark black of my favourite waterproof option . . . and both stay put. Image Source: sephora.com Tarte Opening Act Lash Primer $11 from sephora.com Buy Now