The FINIS Shooter Fiberglass Short Blade Butterfly Stroke Kick Training Swim Monofin is a great tool for improving flexibility in the feet and ankles while working your abs, lower back, quads, and glutes. The fin has a short and stiff fiberglass blade that allows you to simulate race-pace kicking and tempo. These fins are perfect for long distance butterfly training, breaststroke drills, and backstroke underwater workouts. Ideal for competitive swimmers who want to develop quick and powerful kick, the Shooter is a useful tool for underwater drills, breaststroke technique and butterfly conditioning. Develop a powerful dolphin kick that is generated from the hips by training with this swimming monofin. High speeds enable important streamlining adjustments. Not recommended for children under the age of 12. Please Note: Each Monofin's paint may be unique, as they are similar to another fin models' mold. Therefore, their paint may not be completely symmetric on the actual fin.