Oxygen blocking mask simulated high-altitude running mask self-abuse physical fitness training

Description

100% Brand new and high quality* Masks structure: two from outside surface layer in a layer of superfinemelt-blown non-woven filter paper, with aluminum strip, round rubber nose,folding* The respirator use: permeability is good Don \ 't boring Can achieve the effect ofdust The bridge of the nose with aluminum strip can be fixed role. No particleultrasonic sealing edge, wear comfortable* Non-woven masks for one-time items, easy to use, and make relevant purificationtreatment, can be used for food. The medical, pharmaceutical, electronics,textiles. Clean room operators, also can be used to do everyday products. Manyindustries* Advantages: ventilation, dust and filter bacteria* Color: As picture show