I am sorry, I forgot to say that they are very sturdy and well-made.
And if you are comparing them to FB, they are rather different in style - they don't lie flat before you put them on like the FB do, they curl up because of the elastic. The suedecloth rolls out from inside the leg, the elastic is not top-stitched in like the FBs. And mine was rather thicker PUL than the FBs I have.
But again, I only have one and it is not new, so she may have changed things.