Our fully personalized sweatshirts are available in two different materials. Our stretchy sweatshirts have a high quality print and are made of 100% polyester. With this material, we ensure maximal comfort and warmth for your little one as well as a more vibrant print. Our cotton sweatshirts have a high quality print and are made of 90% cotton and 10% elastane. These premium and high quality materials ensure maximal comfort and breathability, as well as providing a more durable experience. Both sweatshirts are washing machine safe. The design will last longest when washed inside out on a gentle cycle, cold wash, and hand wash. Do not tumble dry. If you want the sweatshirts to last your little one as long as possible, we recommend buying a size up.