Blades are the same, it is the foot pocket that is one-sided, so will not affect performance. Force Fin Fab Force Flipper Slippers with sparkling dot fabric foot pocket. Part of an international design winning product line. The most comfortable swimming fin you will ever wear. You’ll be able to kick all day long, and into the night too! That is how comfortable the padded foot pocket is. Snappy polyurethane blade. Exclusively by Force Fin.