@DarkTrig @Bob_Wachter It's somewhat subjective too. If I'm going to wear an N95, I find the non-valved Aura more comfortable than the commonly available valved ones (mostly hard shell), and just as easy to breathe.
For me, don't see the point of going valved, but fit and subjective comfort vary.
@DarkTrig@Bob_Wachter这也有点主观。如果我要穿N95，我发现非带瓣的光环比常见的带瓣光环（大多为硬壳）更舒适，呼吸也同样容易。
对我来说，我看不出换瓣有什么意义，但合身度和主观舒适度各不相同。