If you're looking at those, you might have seen my other reviews by this seller and manufacturer.  I ordered several pairs of leggings from this seller and company and being a size 4 or 6 depending on the week, all of the other leggings/stockings I ordered fit, but this pair did not fit me at all.  Very disappointed, waste of too much money for the leggings and the shipping.  If you're smaller than a size 4, maybe you can wear these,  See my review below for this company's other, similar products.

 I'm an elementary art teacher and purchased these to go under skirts and dresses.  They allow me to crawl around on the carpet and be on my students' level and create art on the floor.  I lived in Asia for several years, so the next statement might sound inappropriate, but is definitely true.  These shipped from Hong Kong and were definitely manufactured to fit the average, thin petite Asian figure.  I am not an Asian woman, I am a little short, and I still wish these were looser.  The "One size" will not fit anyone who is over a size 6 and a 6 is really pushing it. If you're under 21 and thin, you'll probably be okay.  They are a little stretchy and don't feel very high quality although they have lasted longer than most leggings/stocks I've purchased at Target or Walmart or Old Navy.  Overall, I like these and I'm happy I bought them because of the function they provide me at work, but if I had known they would ship from Hong Kong and were designed for a woman living on that continent, I might not have purchased them.  I ordered several different leggings/stockings from this seller and was charged for shipping on each item, even though they all came together, so these ended up being an expensive purchase.