Fit is very comfortable. Highly recommended for the price.
I took the advice of others and ordered the next size up. I wear a 10.5 shoe (typically) so I ordered the 11-13 size and they are comfortable. Not too tight and not too loose. What is not clear from the fins is whether there is a right or left one. Some fins are sided. These appear not to be.
The fins are great for training. You can really feel the burn in your legs when using these. Great for longer distance kick workouts, too. You sustain the kick for longer, building leg strength while getting a good cardio workout.On the advice of previous reviewers, I bought the next size up. I am a size 13 and bought the 14-15. Good move, the fit is perfect.
I try to swim every other day and these are great for workouts. At 6'6", 260-lbs. wearing 12-12.5 size tennis shoe - I first ordered 11-13 - ended up being slightly too tight which led to some cramping during leg work. Ordered a second pair (14-15) and these fit really nice so consider getting the next size up. Fins definitely work the legs, stay on fine and help somewhat with heavy/sinking legs when doing only upper body work as well!
These are awesome, lightweight and my legs get great exercise!!
I bought these to improve my kicking strength. I haven't had them long enough to tell if that has happened but my legs are definitely more sore after a swim since I started using them. The fit is fine - they are a bit snug getting into them but they feel fine while kicking. The increase in speed while wearing these is very noticeable.