cotton. Material and size: This baby sun hat is made of high-quality cotton fabric to keep children soft and comfortable. Design: Double-sided design, easy to match with other clothes. The wide brim protects the eyes from the sun, and the chin has adjustable buttons. Features: 50+ UPF, protect the childs head, eyes, face, and neck from strong sunlight. Light weight, easy to store, suitable for travel. Occasion: A must-have fisherman hat in summer, suitable for children to play on the beach or backyard, fishing, safari, traveling, camping, boating, etc. Best choice: This baby sun hat is the best choice for babies in the hot summer. It can protect the head, eyes, face and neck from strong sunlight. Size: S (48-50) head circumference Color: dark blue Include: 1* Bucket Hat Baby Sun Hat Summer Beach Upf 50+ Sun Protection Baby Boy Hats Toddler Sun Hats Cap For Baby Girl Kid Bucket Hat1pcs-dark Blue