Genuine Force Fins, 1 pair of Slim Fins

Same brand, model and size. One is a slightly lighter blue than the other. The darker fin has the Force Fin logo on the top and the patent number on the bottom. It has a slightly larger foot pocket than the lighter-colored fin. Most people have one foot that is larger than the other so I didn't notice the difference. The fins are interchangeable-- there is no right or left.

Slim Fins are the best all round swim fitness and swim training fin. Slim Fins have an open toe pocket that leverages your swim kick from the large muscles in your thighs, hips and derriere. Gives a better swimming workout. No strain on your knees. Kicking the snappy fin blade helps with flexibility, strength and speed. Swim Fast!

Wiggle your toes!

Slim Fins have an open toe pocket that leverages your swim kick from the large muscles in your thighs, hips and derriere

No knee strain

No calf pain

Increase swim fitness and cardiovascular conditioning levels

Burn more calories

Improve swimming position and swim technique

Extremely high quality and long-lasting. Smaller size makes them easy to pack and travel with. Great for snorkeling

Weight (each): 15 oz

Fin Length: 14 in (to longest point, not including heel strap)

Fin Width: 7 in (at widest point)

Foot Pocket Height: 2 3/4" to 1 3/8"

Excellent working condition. Both have some oxidation on the surface and extremely light wear on the bottoms. The lighter one is missing the backing on the metal rivet at the end of the heel strap, where it folds. This is not an essential piece, plus it will likely remain folded during use.

(from Force Fin site)

I love these fins. I am a fitness swimmer. They were recommended by Total Immersion many years ago. I have a pair over 15 years old. Such a natural kicking motion with them. And the foot pocket helps with ankle mobility. They become part of your leg, not your foot, and engage many more muscles in your legs when swimming. My swim workouts are much better when I use these fins. I know they are not cheap. But it is a worthy one time investment in your personal fitness. They add some variety to the workouts. And more muscles get used. They will last forever.