The Strassburg Sock - REGULAR SIZE (Fits calf size up to 16 inches)
(Measure AROUND calf at the widest point.)

The Strassburg Sock - LARGE SIZE (Fits calf size 16 to 21 inches)
(Measure AROUND calf at the widest point.)

The Strassburg Sock - PEDIATRIC SIZE (Fits calf up to 12 inches)
Fits calf size up to 12in around. Intended for use by children with cerebral palsy and ankle equinus. Generally for children from about 2-8yrs old. The regular size may be more appropriate for children above this age.