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Product name: double-sided hollow cap Top style: hollow top hat Size: adjustable Function: sunscreen, sunshade Fabric name: nylon + ice silk Product features: hollow top design, refreshing and comfortable, accelerate heat dissipation, double-sided two-color wearable, efficient barrier cooling, wide brim, full-face sunscreen, fit the head, comfortable and not strangling, adjustable hat circumference, soft and can be rolled, easy to store and carry!