100% cotton. Hand wash or machine wash on 'delicate' setting with like colors.  Avoid hot water. Lay flat on a towel to dry. You may choose to tumble dry on low heat for 10 minutes and then lay flat on a towel to finish drying more quickly. While we preshrink all of our fabric, cotton knit still has a tendency to shrink a small degree (~1-4%) on the first wash. Avoid high heat dryers to minimize shrinkage.