The GripFixer size is determined by the size of the persons’ hands and fingers. Measure the outer part of the thumb.
Below is a size guide to help you choose the right size.
Length of the outer part of the thumb in centimeters:
Less than 2,4 cm = Size Small (about 4-7 years).
More than 2,4 cm = Size Medium (about 7-13 years or a normal woman sized hand).