When determining the correct size for your child, please consult our sizing chart. Our arm sleeves are designed to fit most children within the specified age group sizes. If you feel your child might be between sizes we suggest you go up to the next biggest size (you can always fold down the cuff at the wrist). The top of the sleeve is constructed with a thin, non-restrictive elastic band to keep it from slipping. Measuring you child’s arm should provide you with the most accurate size. Please contact us at firstname.lastname@example.org with any questions.