3MReusable Respirator, Half Face Piece 7502, Use with Bayonet Cartridges/Filters (Not Included) for Gases, Vapors, Dust, Medium Size

Funcionan perfectamente bien y son muy cómodas. No se necesita más, solamente hay que fijarse y seleccionar el tamaño correcto.

This respirator is amazing! The bottom exhaust will keep your safety glasses clear and breathe-ability is out of this world compared to regular disposable masks. Pair it with the 3M Advanced Particulate Filter 2297 and you will not be disappointed!

All parts of the mask in contact with the face are silicone rubber(unlike the cheaper 6000 series) so feels very soft and comfortable.I have a large head do i was doubting whether medium will fit me, fortunately it fits perfectly.From area between eyes to the chin the mask measures around 13cm.across from cheek to cheek around 12cm.you can use this as reference while buying (medium size)I used it with 2091series p100 particulate filter.i used it to clean an old dusty room.wore continuously without any discomfort around 2hrs.You have to buy filter catridges separately.So best to buy this 7000 series instead of the 6000 series really worth the extra price.

Ottimo! Ottima maschera, leggera, respirazione senza difficoltà e il silicone con cui è composta è morbido e aderisce perfettamente al volto e soprattutto al naso, punto in cui con altre maschere avevo problemi di aderenza. Venditore ottimo, la spedizione è arrivata in anticipo rispetto alle date di arrivo.

Total novice when it came to using this and it's been great. I work with resin and needed to protect myself so bought this after researching online. It was a bit tricky to fit the filters (which didn't come with mine) so if you're new to it then do try to make sure you have them on properly.Also, the filters recommended for this usually last quite a while, depending on what you are doing, but with my resin I needed to replace them after a couple of months, so be aware of this when using.