Solid colors are 100% cotton; heathered and marled fabrics are 90% cotton, 10% polyester. Lapped shoulder seam for easy dressing. Washing instructions: Hand or machine wash cold. Do not dry clean, bleach, tumble dry or iron on the print. The third party printer of this product is evaluated according to International Labor Organization standards. Since every item is made just for you by your local third-party fulfiller, there may be slight variances in the product received