Flex-X · chest-girth reference
Which size fits your chest girth?
Enter your chest girth in inches. Each of the four styles is cut differently, so the size that fits can shift from one style to the next. All ranges are in inches.
inches
Measure around the fullest part of the chest, tape level and snug.
Size ranges by style
Each bar spans that size's min–max girth. Enter a girth above to see where you land.
Compare styles at each size
All four styles side by side within each size, so you can see how the same label runs across styles.