Thank you for viewing! Size is approximately 52cm (measured by hand). This is a sun hat for juniors. Made of a material often used for swimwear, it's perfect for water play, especially at the beach, river, or pool. It dries quickly and feels smooth even when wet. It has a plastic buckle chin strap so it won't come off even when swimming. Easy to put on and take off. UV cut protects your face and neck from strong sunlight and UV rays. The sunshade at the back is removable! Used 2-3 times. Please understand this is a used item. #Sun protection hat #Aqua hat #Marine cap #Sun hat