I LOVE these socks, or, more importantly, my daughter LOVES these socks. My daughter rarely wears any other socks, she finds them uncomfortable and just about throws a fit if there aren't any clean ones when she's getting ready for school. She's seven years old and has been wearing these since she was three. This is the third size I've bought. I love buying all the same kind of socks since it makes matching them really, really easy. The only thing I would like is for them to be a little higher up the leg, they can be a little cold in the winter from the gap between them and the pants. But honestly, my daughter is so sensitive, I'm not sure she would wear taller socks, so perhaps they are fine. There is a seam, but it is so flat that it has never bothered my daughter, but the seam in other socks bother her. She isn't severely sensory sensitive, but is sensitive, obviously. They stain about the same as any other socks. They are thick socks too. Nice and warm, but my daughter doesn't mind wearing them in the summertime. What else can I say? They fit well and snug and are nice and soft. If your child is sensitive to seams, I definately recommend these socks. I certainly recommend them to non-sensitive kids too. They are nice.