Renaissance Swim Cap - Swimming Cap, Size L, Yellow I think it will fit any child's head size. I have written my child's name on it with a marker, so please cover it with white cloth or use name tape to write your child's name. It seems the price will be raised from 1210 yen to 1360 yen in the future. If you purchase other items together, I will discount them slightly. Please let me know in the comments. I will reject price reductions for single items.