I just measured the straps on my mask with a piece of the fabric and then put a mark where my finger was and then measured how wide and how long it should be. Then I cut 2 pieces of fleece 3 1/2"W x 7"L and then sewed them up on the long edge,1/4" seam allowance. Back stitch at the beginning and at the end of the stitching and then use a pair of hemostadts and then turn them right side out and then you unfasten the mask from the straps, depending on the style of he mask and slide them on. If you prefer, you can cut them a little bit wider and add velcro to the long edge and then wrap it around the straps with out having to unfasten them from the mask. They do feel good against the skin and are washable. when I get back from Seattle, I do plan to make a couple of sets of them. I can't get over how many diffrent styles of masks there are and what we have to do to make things more comfortable. Enjoy, Huggies, Fay