This mask is something. First of the kind. It is better than any conventional facemask. I love the heating function in this new mask and I trust the heat can help on protecting me. This heating mask I already know could do no harm!! It is only simple physics – heating on and off. I just feel safer in it. The mask offers so many great other features too. I can breathe in that thing now. My glasses don’t fog as compared to the other masks. The due batteries last long enough. I change the internal face cover cloth every single day (I bought the 10 pack from their website). The filters can be replaced easily with their unique design. It fits in my bag, I can carry it around easily, wear it all day. I also love how well it looks on my face!