One of the greatest features of TriMask is its filtration mechanism. Polyester fabric is a hydrophobic polymer that can easily block respiratory droplets from the external environment. Its particle size ranges between 60nm - 4µm, which is highly unfavorable for microbes to penetrate but good enough for gas diffusion. On the other hand, the randomness of fibers in a spun-bonded NWPP filter for the inner layer provides high particle filtration. This is similar to how filters work in actual surgical masks. This is also the recommended filter by the WHO for washable face masks because of its high integrity (The Conversation, 2020). For the inner layer, cotton will be used because, aside from it being purely cellulose, it has a high affinity to water molecules, especially to those coming from the internal environment when the mask is worn. Cotton is hydrophilic and has a soft texture which would be suitable as an inner material for both the comfort and safety...
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