I bought the largest size possible {13.5 - 16} and they still did not fit correctly over my size 12 Cabela's Predator boots. I mean I can "force" them on,but then the elastic is stretched to the breaking point. They are well made, but make sure that if you buy the size 13.5 - 16 cleats that your pac style boots are, say, size 10 or so...