Premium Polyester Fiber Materials: Soft, highly elastic, comfortable, and breathable for a perfect fit. Adjustable shoulder straps and safe fabric provide head protection against falls. Ultra-Soft Crystal Velvet: Offers a touch softer than a young girl's heart, providing a delicate and soothing feel love to a mother's loving touch. Breathable and All-Season Comfort: Hollow breathable design ensures your baby's head remains cool and comfortable in all seasons, preventing any discomfort. Tailored for Learning to Walk: Specifically designed for toddlers in the learning-to-walk phase, the U-shaped head cushion cradles and protects their delicate heads. Safety and Fashion: High elasticity PP cotton can quickly absorb impact force, ensuring cushioning during falls and providing precise protection for the baby's head when they fall. Manual measurement may have a slight difference of 1-3 centimeters.