K-5000
I would not mail order if your not absolutely sure of the size.
Measure the inside distance from the heel to the toe of the Korker and match to the your wading boot/shoe.
I had a large size which was about a inch or so bigger then the wading shoe. There are times when your between sizes and it is exceptable however I returned for the medium size and it fits perfectly.
Joe Lyons has good service
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