Looks like you're

A Canuck Like Us

Right this way to our Canadian site for pricing in CAD and domestic postage

PM 2.5 Filters for Cloth Face Masks

PM 2.5 Filters for Cloth Face Masks

Regular price USD $10 USD

These disposable filters can be easily inserted into your Unbelts cloth masks to create a third layer between your droplets and the outside world.

Blocking over 99% of particulate matter measuring 2.5 microns or larger, they contain five layers:

  • Softspun nonwoven polypropylene fabric 1
  • Meltblown filter 1
  • Activated carbon
  • Meltblown filter 2
  • Softspun nonwoven polypropylene fabric 2

To use, insert in our adult masks as-is, or into our kids’ masks by folding (not cutting) the two bottom corners. Each adult filter measures approximately 3” x 5”.

Filters can be used for 16-24 hours of continuous use, or until damp; they can be used for approximately a week of occasional wear. Be sure to remove your filter before washing your Unbelts mask, and wash your hands before and after handling.  

Our filters’ efficacy is independently tested by SGS, one of the world’s leading inspection, verification, testing, and certification companies. 

// Remember, even with a filter, out masks are non-surgical and non-medical grade. They are not designed to replace medical-grade PPE.

// For your safety, all Better Together Collection items are final sale.

Research-informed, comfort-first cloth face masks that keep medical masks in the hands of front-line workers

2-layer moisture-resistant design that accommodates your added filter

Organic cotton lining

Fully adjustable nose bridge (no foggy glasses)

Super-soft adjustable straps that secure behind head for comfort

Machine washable

Available in two adult sizes, plus one for littles

A performance-grade shell that keeps moisture in.

Add a third layer with a filter pocket.

Organic cotton lining

Adjustable nose bridge

Comfiest-ever straps


Sizing for all humans

Part of the Better Together Collection

factory sustain

Support small

We’re working directly with family-owned factories who need orders to stay open.


Buy, give, or receive

Purchase for yourself, buy for someone in need, or apply for a donation. We’re all in this together.


DIY supplies

Sew masks at home with your fabric and our ethically-sourced components.