Another reviewer mentioned that these were thin, like dress socks.  I didn't think they were THAT thin, but he was right, they are a little thin, which was why I didn't give 5 stars.  They do feel well made though and are comfortable.  A little thicker in the stitched seam over the toes than I'd prefer, but the shoes I wear these in don't cause a problem, but if you have shoes that are tighter in the toe area, these stitched seams may dig into the toes some.

Only time will tell how well the heels will hold up, as that's where I generally get holes, but the thin part is around the calf, it thickens up all over the foot, so hopefully these will last a little longer than the ones I'm throwing away now that these replaced.