I ordered three sets of nails at the same time: Indigo Aristocracy, Heart Spike, and La Reine. Based on the recommended measurements, I ordered them all in extra small. The sizing for La Reine was perfect; the sizing for Heart Spike was mostly okay; however, the same size in Indigo Aristocracy are unusable, as the bed width is about half the width of my fingernails. They would be more suited to a dog’s nails—that’s how narrow they are. It’s a shame, since they’re beautiful, but there doesn’t seem to be any sizing standard across the types of nails.