Protect yourself and others the next time you leave home with the Face Mask Filter. Sold in a 3-pack, the Face Mask Filter is designed to be worn with the Outdoor Research Essential Face Mask for high filtration efficiency to reduce contamination when in crowded areas.

• Filters greater than 95% of virus, bacteria, and particles in accordance with ASTM test standards
• Reduces the risk of contaminant transmission by utilizing very high filtration efficiency when used in conjunction with a mask
• Made in the USA
• Breathable & Non-Irritating

The filters are designed to be disposable, replace based on your amount of use and judgment. If you live in a hot climate or wear a mask 8+ hours a day to work, you may want to replace your filter more frequently. Average wear should give you approximately 5-7 days.

This mask filter is not intended for medical use. 

MEDIUM Fits the Outdoor Research Small/Kids' Essential Face Mask

LARGE Fits the Outdoor Research Essential Face Mask and the Outdoor Research Adrenaline Face Mask