It's hard to compare them though since the Jet Fin is shaped like the foot of a cartoon clown, whereas the F1 is shaped like a human foot pocket.
Best description ever!
You should be good to go with the XL. I use XXL for size 13 rocks (heavy insulation) and will use size 12 "Warmers" boots in the same pocket if going wet. The Warmers boot is like a hiking boot...... this is the sizing chart off DGX for them....
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