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Lancôme Dual Finish Versatile Powder Makeup
A "wet/dry" foundation, which can be applied with a damp sponge (for more coverage) or with a powder brush (for a sheer finish), is a wise choice when the mercury is high. "Because it's designed to be water-friendly, it doesn't break down or cake in steamy weather," says makeup artist Andrew Sotomayor, who's partial to this Lancôme formula when he's working in humid conditions.

($38; Lancome-USA.com)