Sizes for Arms
Size #1 - 7in to 12in (18cm to 30.5cm)
Size #2 - 12in to 17.5in (30.5cm+ to 44.5cm)
Size #3 - 17.5in to 23.5in (44.5cm+ to 60cm)

Sizes for Legs
Size #3 - 17.5in to 23.5in (44.5cm to 60cm)
Size #4 - 23.5in to 31in (60cm+ to 78.5cm)
* Measure on the arm near the arm pit, and thigh high up in the groin area.