Breathable Face Masks
These 12 Breathable Face Masks Are Summer Essentials
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These Hedley & Bennett The Wake Up & Fight Mask ($22) are no-nonsense masks that don't take up much space (easy to put in your pocket on a walk, for instance). They have a slot to put in a filter, and they're washable (I've washed mine several times and it still holds up). Plus, they donate one for every mask purchased.