My calves are 18" also and I originally ordered the regular size garter ties from Matt. They were too small and I returned them and got the larger size. The larger size does not cut off the circulation in your leg like the smaller ones. Yes there is some stretch but not that much. I'd go for the larger size myself as the comfort is worth the extra bucks for them. I now have four of the larger garter ties.
Nulty
Kilted Flyfishing Guide
"Nothing will come of nothing, dare mighty things." Shakespeare
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