Thanks to the flexible rubber bands, all of which are adjustable, the half-mask does slip, even with heavy sweating. At the beginning the pressure was unusual, but I got used to it quickly and soon I realized the mask barely.
Breathing is stiff at the beginning, but the habituation effect sets here too quickly, even if the exhaled condensate on the skin is moist. The mask is not quite just, unfortunately, collect all of the moisture.
Comfort I find pleasant, as the edges of the mask with a very soft, yet impermeable silicone are reinforced and so nothing pushes unpleasant or scrubs. Also, no particles accumulate at the edge rests on the face, which would then interfere.
My Conclusion
Only for wood saws determined exaggerated, but the half-mask is just great and does what it promises!