Pilling after 4 washes. I had high hopes for these sheets, but they are not performing well in my guest bedroom, where they have had maybe 13 days of folks sleeping on them. They are supposed to be "silky and smooth, satin weave, 400 TC", but they feel like lightweight flannel, thin and not 400 TC, and definitely not smooth and silky. A light pilling bumpiness is now felt all across the sheets, like lying on a sandy beach. I wash the sheets by themselves, in cold water and with a medium heat drying cycle. I'm looking for a replacement sheet set. Would not recommend these.