The work mask is a modification of an N95 cover where the ties are threaded through tubes on the sides. This way the user has the option to change out the ties to a material that they like.
I include here the sewing down of the tucks at the edges of the pockets because it took me a few tries to understand what to do.
Sew down the wire with zig zag in the middle and at both ends. 
Sew top binding over the wire. Do not hit the wire. Breaking needles fly at your face. 
Trim to even with the left and right edges. 
Sew bottom tucks down. 
Sew on bottom binding, don’t catch pocket. 
Trim bottom binding. 
Put edge tube right side to the right side of inside of mask, leave .5 inch or more on each side. Sew down to edge of mask 
Flip binding and iron. Iron top and bottom edges down. 
Iron down hem of edging. 
Fold to match the bottom of the tube and iron again. 
Stitch and trim the top and bottom edge. 
Fold and line up the hem to the bottom tube and sew. This is the hard part to line up, it tries to slip.