Hey everybody! I'm new to scuba. I have a question about fins. I'm looking at buying fins for my class. I was looking at the Cressi SpaceFrog Ones. My problem is with size. I wear a size 10 shoe. I put on some booties (the ones with the rubber sole) I tried a M-L and the XL. How far is your foot supposed to fit. Is your shoe supposed to hang out past the bottom sole on the fin or is it supposed to fit all the way in? They both felt pretty comfortable. I did notice the size difference in the fins between the M-L and the XL. Any help would be appreciated.