Review on Pollution Cover Mouth Filter Accessories by Scott Rao

Easy to use, made a cardboard template to cut out the area on the masks, zigzag stitched the outside and cut out the centre, covered the frayed edges with clear nail polish. Let it dry and pop it in the valve, it really helps if you feel like the standard mask is suffocating you (even if you know it isn't, but otherwise your mind is screaming at you).