Hue Women's Hidden Cotton Liner

Nice fit; too bad it only lasted one use.
I suppose the shoes I wore were too rough or something and made the socks run. Nevertheless, I can't recommend ANY product that only lasts one time. The fit was nice and they stayed on without slipping off my heels (I wear a size 10 and am always a little worried about how women's socks are going to perform) but next time I'll try a different brand.

Great
These don't show, they don't slip, and they are nice and thick without being too heavy. I have 3 pairs. They are great for summer shoes.

Not completely hidden, but hidden enough. And more importantly, they stay on.
I've worn liners before that constantly slip off my heel, bunch up under my arch, and require me to stop every ten minutes or so to fix them. These stay in place because of the little rubber or silicone thing on the heel - I haven't had to adjust them yet. They feel quite comfortable and less flimsy than stockings. The front part, the part that covers my toes, go past where my toes join to the ball of my foot and thus the socks/liners aren't completely hidden. You can see the front edge of the sock (and a little bit of the back edge too, but that is much easier to adjust and hide). I got a pair in black and the shoes that I wear them with are a relatively matte black, so it's not especially visible. It does change the shape of the opening of the shoe though - for instance, the front of the opening of most shoes is relatively squared off (by which I mean the part of the shoe goes over the top of your toes has a somewhat squared edge). The silhouette the sock makes against the front top part of the foot is sort of round. If it were more square, it would probably be less noticeable. That said, I find them quite acceptable when I wear my shoes with long trousers. None of my friends ever noticed them until I pulled my trouser leg up a bit and called their attention to it. Also, the fact that they cover my foot beyond the edges of my shoes has been helpful to me in breaking in a new pair of shoes; they probably saved me a blister or two. The over-coverage of these liners would be more problematic if I were wearing a skirt or dress. Another reviewer mentions that the black ones may cover more than the other colors, so perhaps in cream or tan or white these socks would be more hidden. But my thinking is that if they are going to show at all, I'd rather have the edge blend in with the shoe rather than have a non-matching skin-tone sock edge visible. When Amazon has it in another color, I will try Hue's Cool Contours Low Cut Foot Liner Accessory (currently it is only available in white). From the image, it looks like that liner does not quite cover the full length of your toes, as this one does. As for sizing: I am a size 8/8.5, and the S/M fits me quite well.

Great!
These liners are so comfortable! And I LOVE the rubber-like backing inside the heel that keeps the liner in place. They don't pinch or cramp your toes, either! A+

Didn't like
They do not stay on my foot. The second I put my foot in the shoe and walk, it slides right off. I still have not found an original one that I purchased - wish I saved the product name and model!!! grrrr.