Have ordered many of these. they are the only ones i've found that are low cut enough for most shoes (NOT pumps or ballet/dress flats) and  also stay on pretty well, which most low cut peds do not .  material is cottony, not silky sheer, but not thick as a typical sock. I wear mostly with slip on Skechers or low Keds -like sneaker styles

I have put repeatedly in washer and and dryer and they hold up well.  I do notice a slight tendency for  the elastic to irritate after many hours, around big toe/bone area. Might be slight swelling in my feet - not sure.  The one significant design flaw is a tiny rough seam ending , that is on the inside edge of the top elastic, close to the back, which I find to irritate the skin.  It is only on one side of each sock, but is on every pair