Very airy and light cotton. The only problem for me is that the neck is a bit large (it's a Small already), so I will have to fix that, but it's a great sundress and I love the texture, feel and the lovely blues.
I love this type of super lightweight 100% cotton. The print and colors are beautiful. I just wish there was an XS option because the arm holes are a bit too big for me. I will make it work though because I love the dress. And, pockets are always great!