Orders usually ship within 72 hours of receipt

Setting a New Standard

Reusable Mask

A reusable silicone mask, designed for everyday comfort and protection. The mask is form-fitting with a self-suction seal that has no valves or vents.

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G-Series Mask

Reusable Respirator Mask

Regular price $39.99
Unit price  per 

Full details

The Mask for Professionals

Standard Adult sizes

G-Series Mask

Standard Adult sizes

G-Series Mask

We focused on creating a light, soft and comfortable mask, fit for everyday use. The silicone mask base naturally forms a self-suction seal that doesn’t fog up your glasses and allows for high breathability. The mask has no valves or vents and filters air in both directions on inhale and exhale. New colors available now.

FDA Registered No Glasses Fog Breathable Form-Fitted Eco-Friendly Easy to Clean
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Back to school

G7 Kids Mask

Back to school

G7 Kids Mask

Our G-Series G7 Kids Mask is reusable, breathable and designed to keep your young ones safe. The mask is form-fitted and provides the same protections as our larger masks. Available in our classic blue and hot pink colorways, the G7 is making going back to school a little less stressful. Intended for children ages 7-11.

Ages 7-11 Breathable Easy to Clean Blue or pink Lightweight Eco-friendly
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Click here to learn more

FDA Registration

View Registration

Provisional Patent

U.S. Patent & Trademark Office
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 (8.13.20)

Passed NaCl Test

Average across 20 tests

Filtration Efficiency

98% Filtration

Must be 95% or greater for NIOSH

Particle Penetration

< 2% Penetration

Must be less than 5% for NIOSH

Video Tutorials

Eco-friendly design

Reuse & Replace

Single-use plastics are a global problem. CastleGrade™ products embody a mindset of sustainability. Our silicone face masks are reusable, thereby decreasing waste and minimizing the impact on our environment.

Protect 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.

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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.