Orders usually ship within 72 hours of receipt

G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask
G-Series Mask

Details

The CastleGrade™ G-Series Masks are reusable respirator masks designed for everyday use. The base of the mask is made from a lightweight silicone that forms to your face, leaving no marks and a tight seal. Each mask comes with five replaceable 4-ply filters. Each filter can be used for up to 32 hours of direct use or one week, whichever comes first.

  • FDA Registered as N95 Respirator
  • Over 98% Filtration | NIOSH NaCl test by Nelson Labs (8.13.20)
  • 4 layers of filtering materials

  • Easily cleaned by wiping with disinfectant

  • Silicone seal for superior protection
  • No valves. Filters air in both directions inhale / exhale
  • Fits with glasses comfortably, no fog
  • Each mask comes with 5 filters
  • Filters last 32 hours of breathing time
    (or 1 week, whichever comes first)

Sizing Note: 70% of customers prefer the G9 (Medium - Large) size

G-Series Mask

Reusable Respirator Mask

Regular price $39.99
Unit price  per 
Kids

All sales are final.

Details

The CastleGrade™ G-Series Masks are reusable respirator masks designed for everyday use. The base of the mask is made from a lightweight silicone that forms to your face, leaving no marks and a tight seal. Each mask comes with five replaceable 4-ply filters. Each filter can be used for up to 32 hours of direct use or one week, whichever comes first.

  • FDA Registered as N95 Respirator
  • Over 98% Filtration | NIOSH NaCl test by Nelson Labs (8.13.20)
  • 4 layers of filtering materials

  • Easily cleaned by wiping with disinfectant

  • Silicone seal for superior protection
  • No valves. Filters air in both directions inhale / exhale
  • Fits with glasses comfortably, no fog
  • Each mask comes with 5 filters
  • Filters last 32 hours of breathing time
    (or 1 week, whichever comes first)

Sizing Note: 70% of customers prefer the G9 (Medium - Large) size

Product Features
FDA Registered as a reusable N95 Respirator Mask
Over 98% filtration score on NaCl lab test (Nelson Labs)
Filters on both inhale and exhale. No vents or valves.
Replaceable medical 4ply filters. Lasts 32 hours of direct use.
Form-fitting silicone seal, comfortable & breathable
Easy to wipe down and clean. Dishwasher-safe
No fogging of glasses or professional eyewear
5 standard medical filters included in each mask order
Save 5x over 1 month compared to single-use N95s masks

Disclaimer: In no event shall CastleGrade™ be liable for any direct, indirect, punitive, incidental, special consequential damages, to property or life, whatsoever arising out of or connected with the use or misuse of our products.

Please Note: No respirator can protect 100% against COVID-19 or other viruses. COVID-19 is not yet fully understood. We cannot and do not guarantee that our respirators will protect you against the Coronavirus.

CastleGrade Filter materials
Replaceable Filters

4 Protective Layers

Each G-Series Mask uses a replaceable 4-ply filter that has been tested to block microparticles at over 95% efficacy. The mask has no valves. Air is filtered in 2 directions, on both inhale and exhale.

Our filters are custom-fitted to the G-Series Masks and should be replaced either weekly or after 32 hours of direct use. When in use, the filter's blue side (PP Meltblown) should be facing in towards you.

Lab Tested Reuse for 32 hours Buy in Bulk
Nelson Labs USA (8.13.20)

Passed NaCl test

Average across 20 tests

Filtration Efficiency

98% Filtration

Must be 95% or greater

Particle Penetration

< 2% Penetration

Must be 5% or less

Video Tutorials

Alternate Straps Available!

Need additional or alternate straps for your G-Series Mask? Do you prefer straps that go around your ears instead? We now offer both long, soft around-the-head straps, as well as around-the-ear straps.

Protects against Smoke

Charcoal Filters

Introducing our activated carbon filters that aid in removing toxins from smoke and fumes. These medical 4-ply filters have been lab tested to show over 98% filtration efficiency with less than 1% particle penetration.

98% efficiency Filters smoke Activated Carbon
Learn More

Sizing Guide

CastleGrade

Customers are loving the G-Series!

78%

of customers feel safer in the G-Series than in other masks

56%

of customers feel the mask is more comfortable than a standard N95

93%

of customers said reusability and eco-friendliness was a factor purchasing

Registrations

Click here to learn more

FDA Registration

View Registration

Provisional Patent

U.S. Patent & Trademark Office
  • CastleGrade makes superior masks that actually allow you to breathe comfortably and if you wear glasses they do not “fog up”.

    Martha Stewart

  • I received the G-Series. This will be the new standard for the medical industry. It feels like you are wearing a cloud compared to the other masks out there that leave us with daily damage to our skin.

    Dr. Lauren Becker DDS

Frequently asked questions

Entrepreneur and business owner Anna Grinvald invented an earlier version of the G-Series in December. Anna’s mother lives in a senior care center in Israel and complained about how typical masks were fogging up her glasses. Ron Grinvald, a former injection mold specialist for several parts on the NASA spacesuit worked with Anna and eventually Dan Castle, owner of Castle Brand Group to improve it. The G-Series has recently been tested by the FDA, Nelson Labs, Alpha Labs and SMQ Labs and has performed extraordinarily well. 

Yes, click here to view our registration on the official FDA website.

The G-Series filter has been lab tested by several third-party labs. Results from these tests have shown a level of filtration efficiency over 95% consistently, with Nelson Labs performing the Bacterial Filtration Efficiency (BFE) test which returned a 99.8% efficiency score. (N95 Masks are 95% BFE)

The G-Series Mask has been tested by several third party labs. Please click on the Science tab to learn more.

As a standard, we recommend purchasing the G9 size. The G8 size is recommended for teenagers and women with small head and face features (70pct of women prefer G9).

Remove the 4-ply filter and place it in the dishwasher. You can also submerge it in boiling water for 2 seconds. If you prefer to keep it clean throughout the day you can wipe it down with any disinfectant.

You can wear the mask for up to 1 week or 32 hours of direct use, before replacing the filter.

Wearing a high protective, silicone mask will slightly alter / muffle the sound of your voice.

We manufacture in several countries including Vietnam, Czech Republic, Germany and China.

Don’t! Keep the mask and buy replacement filters on our website when you are running low or sign up for the subscription so you never run out. We cringe seeing so many masks being discarded after just one day of usage and Mother Nature needs your help.

For safety purposes, once the product has shipped, we consider the respirator mask unfit for use by another customer. Thank you for understanding.