These sheets are well made with deep pockets and some very wide elastic which ensures that it hugs the corners of the mattress.  They feel like they are made from some good quality material and are stitched well, I didn't see any loose stitching.  I've had some sheets that were very thin and didn't hug the corners of the mattress very well, that isn't a problem or concern with these sheets.  They do wrinkle quite a bit when you wash them, so if you don't like excessively wrinkled sheets that you don't need to iron, you won't like these.