Well, what do you expect; as with every liner, this is probably the most expensive bit of cloth you will ever buy, but worth while for me.
The liner feels slightly warmer than a regular cotton sheet, however it is significantly lighter and thinner. It is non-stretchy, and the toe has a double seem (forms a box) to accommodate the hight of your feet without wasting any of the length of the liner.
I much prefer this cotton/silk blend to the pure silk liners as I find pure silk a little clingy. I would say this feels like a very fine cotton to the touch, being more matt than silk.
Regarding durability, this would not stand up to anything near what a regular cotton sheet would, however this does make it much lighter and more compact. The material is sufficiently thin that I can feel the texture of the outside of my sleeping pad, however not enough as to leave a pattern on my skin from the pad. It also does not have any kind of zip/button etc to allow you to open it up - it is a fully sewn tube, top entry only. It comes with a nice little zip bag that forms a tube that fits in slightly less than a double palm of the hand. This size will also be able to be compressed by ~30% under weight of other stuff in your pack.
I am a very hot sleeper, and will probably use this without a bag at all down to ~12-15 degrees C. After that, my light summer bag is warm enough down to 5 degrees C for me. I suspect this may add a couple of degrees to that.
In summary, its really expensive for what it is, but it's the best liner I have tried. I would like to try one of the stretchy, moisture wicking liners, but will have to wait for another time. 4 star for the product, but only giving it 3 because it really isn't worth $50.
I am not sure if this is a fault with my particular unit, or a design flaw with all Vizz Headlamps, however I am not happy with the hinge that adjusts the inclination of the lamp on the head bracket. The hinge is very loose, and flops down so the light is pointing at my feet under even a light jog (it does not flop down with a gentle walk). There does not appear to be a way to adjust the hinge to make it tighter to avoid this issue, and I have resorted to trying to jam bits of paper in it to keep it up. I am not sure if all of these lights are like this or if this particular one is faulty, however I don't see how they all wouldn't have this issue if the hinge cant be tightened.
The lamp is also not as bright as I expected given the lumen rating. The main bulb (max bright) cannot be operated simultaneously with the 'ultrabright' LED's, meaning you have to use one or the other. While this is fine 90% of the time, there are times I need a bright centre, with the additional wider spread.