ASO/AFO Sizing Chart

The average person can state their shoe size without hesitation, but it is rare to find a person who knows their ankle size. Shopping for an ASO in person is one way to ensure proper ASO sizing, but choices will be limited to a particular vendor's inventory. Buying ASOs online is often a better solution to find the product and brand you’re looking for. However, that presents the issue of proper sizing.

A good way to achieve proper ASO sizing is to begin with a simple question: What is the average ankle size?

Podiatrists suggest that the average female ankle is from 10 to 11 inches in circumference, and the average male ankle is slightly larger. For most sizing options, that would place the average ankle in a size “medium.”

You can also size your ASO/AFO based on your current shoe size. Below, you’ll find a graph that will help you properly size your ASO before purchasing.

ASO/AFO Sizing Chart
Men	6-7	7 ½ - 9	9 ½ - 11	11 ½ - 13	13 ½ - 15	16+
Narrow	xxs	xs	s	m	l	xl
Regular	xs	s	m	l	xl	xxl
Wide	s	m	l	xl	xxl	xxl
Women	5 - 6	6 ½ - 8	8 ½ - 10	10 ½ - 12	12 ½ - 14
Narrow	xxs	xs	s	m	l	n/a
Regular	xs	s	m	m	l	n/a
Wide	s	m	l	l	xl	n/a

Interested in learning more? Get in touch with MMAR Medical today!