Fabric: Our knotted hats are made out of 95% viscose from bamboo and 5% spandex to provide a soft, stretchy fabric, keeping baby’s head warm and cozy. Fit: Newborn to 4 months with an adjustable knot at the top for a perfect fit Style: Our original print designs are made to be fun, vibrant and reflect a Coastal lifestyle. Care: Machine wash cold with like colors, tumble dry low, do not bleach.