TUSA Hyflex Switch Scuba Diving Fins

TUSA Hyflex Switch Fins: Open-Heel Scuba Fins Built for Efficiency and Travel

The TUSA Hyflex Switch fins are open-heel scuba fins designed for recreational divers who want a capable, responsive blade without hauling heavy gear to the dive site.

If you dive in booties, prefer a fin you can adjust on the boat, and want something that packs down small without sacrificing performance, these are worth a serious look.

The Blade: What Makes It Move Water

The blade is made from polyurethane, which gives it a snappy, quick-return flex. Unlike stiffer composite blades or softer rubber blades, polyurethane sits in a middle ground: it loads up as you push through the power phase of your kick and rebounds quickly, so the fin feels lively rather than sluggish.

The blade is vented, meaning it has an opening that lets water pass through on the recovery stroke. This reduces the drag you feel as you bring your leg back up, which matters more than it sounds on a long dive. Less resistance on recovery means less fatigue over an hour in the water.

TUSA adds what they call a Vortex Generator: six raised ridges positioned behind the blade vent. The idea is to manage the way water flows across the blade surface during the kick, reducing turbulence and making each stroke more efficient. It is the same principle you see on aircraft wings and performance swimwear, applied here to the fin blade.

Angled Blade Design: A Geometry Fix Worth Understanding

Most flat fins are built as if your foot points straight out from your leg when you kick. It does not. When your leg is extended in a kick, there is a natural angle between your heel and your calf.

A standard flat blade wastes some of that stroke because the blade is not aligned with the direction you are actually pushing. TUSA's Angled Blade Design accounts for this by setting the blade at an angle that matches the natural position of your foot mid-kick. The result is that more of each stroke translates into forward movement rather than being lost to misalignment.

TUSA puts the efficiency loss from a flat blade at around 10%. Whether you feel that difference will depend on your kick style, but the geometry argument is sound.

Foot Pocket and Strap

The foot pocket uses a multi-compound construction, meaning different materials are used in different zones. Harder material where you need power transfer into the blade, softer material where you need comfort against your bootie. This is a practical approach that reduces hot spots on longer dives.

The strap is a bungee-style universal strap with a large rubber heel cushion and a finger loop. It stretches to go on, locks down when in place, and has five adjustable positions so you can fine-tune the fit over different bootie thicknesses. Donning and doffing at the surface or on a rocking boat is genuinely easier with this setup than with a traditional buckle strap.

Travel and Packability

TUSA built the Hyflex Switch around what they call the Hyflex System, designed to keep the fin compact and light for travel. If you are the kind of diver who flies to dive destinations and watches bag weight, this matters. Open-heel fins can run large and heavy; these are designed to avoid that.

Sizing, Colors, and What Is in the Box

• Heel type: Open heel, worn with dive booties
• Blade material: Polyurethane
• Foot pocket: Multi-compound rubber
• Strap: Bungee strap with five adjustable positions and rubber heel cushion
• Blade type: Vented
• Sizes and colors: Multiple options available

Who These Fins Are and Are Not For

The Hyflex Switch suits recreational divers who want a well-engineered open-heel fin that travels easily and performs comfortably across a range of conditions.

If you are a full-foot fin user who dives warm water without booties, these are not the right category. Open-heel fins require booties and are better suited to cooler water or divers who prefer the added ankle protection and adjustability.

If you are a technical diver who needs a stiff, high-thrust blade for heavy gear configurations or strong current work, a stiffer blade designed specifically for that use case may serve you better. The Hyflex Switch is tuned for efficiency and comfort over raw power.

For recreational divers who want a fin that kicks efficiently, fits securely over a bootie, and does not punish your luggage allowance, the TUSA Hyflex Switch is a well-thought-out choice.