Winter Mask Wearing Tips
Change your mask when it gets wet.
A wet mask is harder to breathe through, is less efficient at filtering, and vents more around the edges of the mask.
Keep a spare mask to replace one that becomes wet from moisture in your breath, snow, or rain.
Store your wet reusable mask in a plastic bag until you get home and can put it in the laundry.
If you need to wear a scarf, ski mask, or balaclava, wear it over your mask. Those used for warmth are usually made of loosely knit fabrics not suitable for use as masks.
If you wear glasses, find a mask that fits closely over your nose or has a nose wire to help reduce fogging. Consider using an antifogging spray that is made for eyeglasses.