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Note that on the price sheet it reads "girth size".  This table reflects the girth and largest part of the belly measurement.  Example:  If your horse girth measures 72" and belly is 78", the E2 size is what you want.  Then you only need to decide the top line measurement.  Make sure you do not measure on the wither, but at the base of the wither to just in front of the flank area.  See the red lines on the picture.

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