Curious what kind of design workarounds we'll see for really hot and/or humid regions -- where I live, it's pretty comfortable to wear a mask 90% of the time. But where my parents live, it's a very different story: hot, humidity 90%+ a lot of the time, often rainy, few places have A/C. Wearing a mask is a lot less pleasant there and I suspect that's part of why mask mandates have seen resistance there.