Covers an extra long child arm up to the upper bicep just below the armpit (68cm length, 42cm circum).
Suitable specifically for "longer-limbed" children those arms have grown length wise, but haven't developed to "adult thickness" yet. For covering casts and other injuries that cover the majority of the arm.
Child Sizings - Part of what determines the size of the child range is the opening that seals to the body above the cast. If your child is around puberty age where their limbs have grown close to 'adult size', please choose appropriately and consider the adult sizes.