Need we say more?
 
Interior Fabric:  100% organic cotton; Exterior Fabric:   84% polyester and 16% spandex.  Not medical grade.
 
Child Sizes: 
XS fits children 2-4 years old
Standard fits children 5-10 years old
 
Adult Sizes:
Small:  4.25" x 8"
Standard:  4.5" x 8.5"
XL:  5" x 9"