The Best Face Masks That Are Not Hot
23 Breathable Face Masks That'll Help Keep You From Getting Too Hot
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The Hedley & Bennett The Wake Up & Fight Mask ($22) is a no-nonsense mask that doesn't take up much space (easy to put in your pocket on a walk, for instance). It has a slot to put in a filter, and it's washable (I've washed mine several times and it still holds up). Plus, the brand donates one for every mask purchased.