I purchased some from City Threads dot com -- they're cotton. $8.50 after the 15% off coupon.
I also purchased some from Nine Line, which is a Veteran Owned apparel company who is selling them at cost because his mother is a nurse & his father has cancer so he is just fulfilling a need.
10 for $9.50
Hope that Helps.
I went to that website. It is just a thin stretchy material & most likely won't help anything at all. But thanks for sharing!