The Next Era of Protective Masks

See what sets us apart from other masks.

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About the Filter

Our G-Series Masks use a 4-ply filter composed of 4 layers of filtration materials. Air and mircroparticles are filtered 2 ways, both in and out of the filter. When using, the blue PP Meltblown Non-woven layer should face the direction of your mouth. 

The G-Series filter has been lab tested by several third-party labs. Results from these tests have shown a level of filtration efficiency score considerably higher than N95 masks across multiple lab tests.

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99.8% effective

Bacterial Filtration Efficiency


PM 2.5

Size of Particulates


28.3 L/min

Andersen Sampler Flow Rate


About the Mask

The CastleGrade G-Series Masks use a patent-pending design made from a soft, form-fitting silicone base. The natural self-suction offers a seal superior to surgical or cloth masks, while providing more comfort than traditional N95 masks.

ALPHA LAB TEST (Mask & Filter)

98.2% BFE

Bacterial Filtration Efficacy


PM 2.5

Size of Particulates


28.3 L/min

Andersen Sampler Flow Rate

Reusable & Sustainable

Looking Forward For Solutions

Single-use plastics and protective gear is a problem. We strive to have our products truly embody a mindset of sustainability. 

Our G-Series masks are reusable, thereby decreasing overall waste and minimizing the impact on our environment.

Medical-grade silicone

Medical-grade polycarbonate

4-Ply filter with >95% BFE

Medical-grade polycarbonate

Medical-grade silicone


The Stone Bag

Our G-Series Masks and Replaceable Filters come safely sealed and packaged in the CastleGrade™ “Stone Bag”.  
The packaging will completely biodegrade in 14 months and does not need to be recycled.

Safety & Comfort

What Sets Us Apart

The G-Series Masks offer a best-in-class level of protection, while providing a comfortable, reusable product that you can wear everyday.

Provisonal Patent on Reusable Silicone Mask

We have patent pending with the USPTO

Efficiently protects against microparticles

Tested to block over 95% at PM2.5

Soft, form-fitting design with high breathability

The silicone base allows for all-day comfort

Eco-friendly materials, reusable design

Reuse the mask daily, just change filters

Easily cleaned by wiping with disinfectant

Sterilized with boiling water or 75% alcohol

Mask fits with glasses comfortably, no fog

Wear without having your glasses fog up

Medical Board

Dr. Richard Firshein

Medical Board Director

Dr. Richard Firshein, DO, is board-certified in family medicine, and a leading authority in the fields of Integrative, Anti-Aging, and Precision-Based Medicine. He embarked on his journey as a physician over 25 years ago and founded the Firshein Center for Integrative Medicine on Park Avenue in New York City. As an early pioneer in Integrative Medicine, his mission has been to help each of his patients achieve not only an optimal health span, but also an extended lifespan.

Dr. Lauren Becker DDS


Dr. Lauren Becker is a general and cosmetic dentist with a wide range of skills and experience in the field of dentistry. Dr. Lauren Becker received her Bachelor of Science degree in Cell and Molecular Biology from Binghamton University. Immediately following her undergraduate education, Dr. Lauren Becker was accepted to New York University College of Dentistry where she received a Doctorate of Dental Surgery. Dr. Lauren Becker has completed a postgraduate residency at North Shore University Hospital in Manhasset, New York.