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Features
- The ZIP VX leverages the energy created by the fins movement through the water to produce a spring board effect that boosts swimming efficiency, ensures proper body position and increases thrust The ZIP VX Fin is an excellent tool for all swimmers from the beginner to elite level.
- Boosts thrust by directing water through Vortex Channel and using it to propel the swimmer forward.
- Increases efficiency by leveraging vortices created by swimmer’s natural kicking motion.
- Improves kicking mechanics and reduces fatigue due to short and narrow blade.
- Improved fit and comfort from adjustable comfo-strap.
- Vortex Channel.
- Grip pads on blade for pushing off wall.
- Sizing Chart
- S: Men's 4-7, Women's 6-9
- M: Men's 7-10, Women's 9-12
- L: Men's 10-13, Women's 12-14
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Poor design and heavy 
I cancelled the order for this so can’t review