The Aqualung Cyclone-X Freediving Fins – Sand are designed for freediving and spearfishing with appropriate training. Check the foot-pocket fit separately from blade length, and select the size for the wearer’s feet and intended footwear.
Features and benefits
- Modular construction: removable blades allow packing and compatible component replacement.
- Thermoplastic blade: a medium-soft polymer blade with channels and lateral ribs.
- Thermorubber foot pocket: flexible contact around the foot with support for transferring the kick.
- 20° blade angle: angles the blade relative to the pocket.
Technical Specs
| Specification | Details |
|---|---|
| Model | Aqualung Cyclone-X |
| Use | Freediving and spearfishing with appropriate training |
| Footwear | Check fit with your intended fin socks |
| Style | Full foot; removable long blade |
| Blade | Thermoplastic polymer |
| Foot pocket | Thermorubber |
| Blade angle | 20° |
Aqualung Cyclone-X size and fit guide
| Fin size | EU shoe size guide |
|---|---|
| XS | 36–37 |
| SM | 38–39 |
| MD | 40–41 |
| ML | 42–43 |
| LG | 44–45 |
| XL | 46–47 |
Confirm blade and attachment compatibility before buying replacement parts; carbon blades are separate upgrades, not included with these fins.
All sizing is a guide only; foot width and shape affect the fit. Try the pocket with the socks you intend to use, if applicable. It should hold your foot securely without curled toes, pinching or excessive movement. Do not select a loose size simply to leave growing room.
To measure your feet, place paper against a wall, stand with your heel gently against the wall and mark your longest toe. Measure from the wall to the mark in centimetres. Repeat for the other foot and use the longer measurement. Where a model has no foot-length chart, contact us with that measurement and your usual shoe size rather than using another fin model’s chart.
Assembly and replacement parts
Follow the manufacturer’s fitting and assembly instructions. Check screws, clips and retaining components before use. Replacement blades must match the pocket and mounting hardware; compatibility is not established by blade length alone. Avoid forcing incompatible components together.
Choose fin stiffness and length for your ability and training. Long fins and replacement blades do not replace freediving instruction or appropriate buddy procedures.
Care and storage
Rinse in fresh water after use and remove sand from the foot pockets and adjustments. Dry in the shade before storing away from heat and direct sunlight. Store blades flat without bending them or placing heavy items on top. Check straps and buckles before your next swim.





