Made with a durable & water resistant nylon material, these caps are lightweight and breathable for our tiny friends to rock comfortably all year long.  Sizing: All of our hats have a flexible Velcro latching system to allow for littles to adjust and grow with their caps. Infant: Designed to fit 9-24 months  Toddler: Designed to fit 2-5 years old.  Youth: 5-10 years old Adult: One size fits most If you are unsure on sizing, please measure your child's head and/or check out our size guide.