I use respirators for a long time when sanding furniture. But I was dissatisfied with the vast majority of models. Because almost always my glasses fog up when working with the mask in a short time. Which unfortunately also in this rather expensive 3M Aura respirator the case. Both the seat and the comfort is good. However, the mask smells a little uncomfortable at first, and the mask quite small, it fits more to a narrow faces. The mask is light, can be folded well and with FFP3 has a fairly high protection factor. The breathing valve is good and the respirator is not too moist. If the somewhat disturbing smell and do not fog the glasses, I would give 4 stars. But unfortunately, this model is not suitable for eyeglass wearers, therefore only 3 stars!