When Fourth Element released its Military Grade Tech Fin, it wasn’t just about style. It was about performance, precision, and purpose. Inspired by the needs of technical, military, and rescue divers, this fin takes the trusted design of the original Tech Fin and gives it a serious tactical upgrade.

The Military Tech Fin is constructed from natural rubber with a density gradient, carefully engineered to balance flexibility and stiffness across the blade. The result is powerful thrust when needed and refined control when performing technical manoeuvres.

Unlike many fins on the market, the Military Tech Fin is completely non-magnetic — no metal parts, no interference with compasses or sensitive equipment. The vented blade design reduces drag and enhances efficiency, while the double bungee strap system replaces traditional springs for quick donning and durability.

The fin’s slightly negative buoyancy makes it a dream for drysuit divers or anyone carrying heavy gear, helping to maintain horizontal trim underwater.

Where this fin shines is in tight spaces — wrecks, caves, or areas requiring precise buoyancy control. The short-bladed, wide design provides exceptional manoeuvrability without sacrificing thrust, allowing divers to back-kick, helicopter turn, or hover effortlessly.

In performance tests and diver feedback, the Military Tech Fin shows:

• Excellent responsiveness in confined environments
• Consistent propulsion in mid-to-low effort flutter or frog kicks
• Predictable stability even when task-loaded with stage bottles or scooters

For military and professional divers, that level of reliability is critical.

Compared to the standard Fourth Element Tech Fin, the Military version is more robust and purpose-built. Both fins share the same shape and hydrodynamics, but the Military Tech Fin includes:

• Non-magnetic components
• Double bungee strap instead of metal springs
• Higher-density natural rubber for increased durability
• Tacticalfinish designed to withstand rougher use

While it may not deliver the same raw thrust as stiffer fins like the Apeks RK3 HD, it excels in comfort, control, and reduced fatigue — ideal for long or technical dives.

The Military Tech Fin is perfect for:

• Technical divers operating in overhead or restricted environments
• Public safety, rescue, or defense teams requiring non-magnetic gear
• Drysuit divers who benefit from slightly negative fins
• Divers seeking high precision over brute force

A few divers noted that the bungee strap tension can feel firm initially, and that the fin’s shorter blade doesn’t deliver the same surge as longer, stiffer fins in strong current. Still, the trade-off for control and comfort makes sense for most users.

The Fourth Element Military Tech Fin is not just another fin — it’s a specialized tool designed for divers who demand reliability, performance, and control. With its military-grade construction, non-magnetic materials, and refined trim balance, it’s one of the most purpose-driven fins on the market.

If your dives demand precision and confidence — whether you’re in training, exploration, or mission-critical operations — this fin delivers.