Apeks RK3 HD Scuba Diving Fins

$219.00

Boots: Required
Foot pocket: Open heel
Buoyancy: Negative
Strap: Steel spring

Color: Black

Size: Large

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Description

Unleash your diving potential with the Apeks RK3 Open Heel Dive Fins, meticulously crafted in partnership with the US military. These fins are built to thrive in the most challenging underwater environments, ensuring outstanding performance and reliability for every adventure. What sets this model apart is that it is made from a higher density material than the standard RK3, making way for a stiffer fin with negative buoyancy.

The oversized foot pocket is ingeniously designed to fit comfortably over drysuit boots, offering a snug and secure fit. Say goodbye to frustrating struggles during gear changes, thanks to the innovative spring strap system that allows for quick donning and doffing.

Experience the thrill of effortless movement with the short wide blade that maximizes forward thrust while providing excellent maneuverability. No matter if you're navigating warm waters or rocky beaches, these versatile fins are your perfect dive companion, engineered to enhance your underwater explorations.

One pair of Apeks RK3 HD fins with fitted spring straps
User manual

Get support from passionate diving experts dedicated to going the extra mile for you.

Troubleshooting a product issue
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Installing components

(805) 967-4456 info@sbaquatics.com

Find your fin size

Size	US shoe	EU shoe
Small	4–6	35–38
Medium	7–8	38–41
Large	9–10.5	42–44
X-Large (Super)	11–14	45–48

Apeks sizes the RK3 to your shoe size worn with a wetsuit boot. Try them on with the boots you dive in; between sizes, go up.

Product Features

Higher density rubber
The HD compound is stiffer than the standard RK3 and negatively buoyant. Choose it when those characteristics suit your setup.
Short, wide blade
A compact, broad blade delivers forward thrust while preserving maneuverability.
Vented propulsion
Vents reduce resistance on the upstroke and help drive the downstroke.
Rugged construction
Durable thermoplastic rubber and two large grommet holes suit demanding dive-site access. Supplied spring straps help with gloved handling.

Is it right for you?

Who it’s for

Technical divers
Divers wearing boots
Wetsuit divers
Drysuit divers

Best for

Negative buoyancy
Gloved handling
Booted diving

Fit & design

Blade stiffness: Stiffer than RK3
Foot pocket: Open heel
Blade material: High-density TPR
Strap: Steel spring
Boots: Required
Buoyancy: Negative

Find your fin size

Size	US shoe	EU shoe
Small	4–6	35–38
Medium	7–8	38–41
Large	9–10.5	42–44
X-Large (Super)	11–14	45–48

Apeks sizes the RK3 to your shoe size worn with a wetsuit boot. Try them on with the boots you dive in; between sizes, go up.

Boot fit

Try with your actual wetsuit or drysuit boots; shoe size alone does not establish fit.

Wetsuit boots
Drysuit boots

Add-ons

Specifications

Design

Boots: Required
Foot pocket: Open heel
Blade material: High-density thermoplastic rubber (TPR)
Blade shape: Short and wide
Blade stiffness: Stiffer than RK3
Buoyancy: Negative

Straps and handling

Strap: Steel spring
Strap material: Stainless steel
Spring replacement: Push-pin mechanism
Carry points: Two large grommet holes for most carabiners

Sizing and measurements

Sizes: Small, Medium, Large, X-Large (Super)
Fit reference: Wetsuit boot; verify with your actual boots

Product Details

User Guide

Download User Guide →

Shipping & Returns

Free standard shipping on orders over $50
Free 2-day shipping on orders over $300
Standard Ground delivery in 3–5 business days
Most orders process within 1 business day
Free returns within 60 days — buyer covers return shipping unless it's our error
Free return shipping on exchanges

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Questions? Email info@sbaquatics.com or see our full Shipping & Returns Policy.

Frequently Asked Questions?

What changes with the HD version?

Its higher density compound is stiffer than the standard RK3 and gives it negative buoyancy.

Can I use wetsuit boots or drysuit boots?

Yes. The oversized pocket accommodates both, but their different volumes can require different fin sizes.

How do I find my size?

Start with the official wetsuit-boot reference table, then check the fit with your actual boots. The source does not identify its US scale by gender.

Are spring straps included?

Yes. Spring straps come fitted as standard; the package also includes the fins and a user manual.

Can the springs be replaced?

Yes. Apeks specifies a push-pin mechanism for spring replacement. Choose compatible parts; a strap made for another fin is not a verified substitute.

How should I clean and store them?

Rinse with fresh water and air-dry away from sunlight. Store cool and dry without twisting. Follow the manual and avoid detergents, solvents, oils, and prolonged heat.

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