I have only tried the mask briefly, to see if I can use it for my intended purpose. They are really good. I will use them next year to crop my Efeuwände. The result is a me very unpleasant dust from pollen and other substances. It is rightly pointed out in the description that the mask is not suitable for gases, etc., just for - or rather against - dusts. Delivery, price and quality are ok. Recommended.
