S: Suitable for head circumference 44-50cmM: Suitable for head circumference 50-56cmThis adorable and classic cap is perfect cap for anywhere your kids go. This cap combines both colorful styles to turn your head and comfort for your all-day wear. You can use it for your kids usual day-to-day activities. A Must Have Item!PREMIUM QUALITY - The cotton make it, cozy and comfortable for the perfect fit, especially for daily activities. So, your kids dont want to take it off. Fine cotton fabric protects sensitive scalp from Ultraviolet. Also, soft cotton makes it packable and crush-able, so you can bring it everywhere easily for your kids. Comes in Various Colors.