These rough silk knit leggings are warm, stretchy, and comfy. We used to buy them when we visited China and it's a lot easier to buy them on Amazon now! They breathe well, unlike manmade fabric. If you are looking for a shiny silk, this is not it. Silk has been used for underwear in Asia for forever in a rough knit for heavy long underwear (basically leggings) as well as smoother (still not shiny) knit for panties etc. It is very warm. I think the shiny stuff is called charmeuse. Remember that these are international sizes and buy a bigger size. I don't know what happens if you put these in a hot dryer, but they'll probably shrink. I throw them over a chair by the radiator.