Apeks RK4 Fins

Step into the water with confidence. The Apeks RK4 is a precision-engineered technical fin designed for divers who demand control, efficiency, and versatility — whether you're frog-kicking through a wreck, back-finning in a cavern, or cruising open water on a long dive.

Crafted from a single piece of durable rubber, the RK4 strikes the perfect balance between rigidity and flex. It's neither too stiff nor too soft — delivering powerful thrust on both the upstroke and downstroke while keeping your air consumption in check. The reinforced blade edge gives you precise directional control, while the flexible tip absorbs energy efficiently so your legs don't.

Key Features

• Optimised for frog-kicking, back-finning, and open-water diving
• Single-piece rubber construction — durable and fully recyclable
• Adjustable stainless-steel spring straps with 2 adjustment points per side (~2cm range)
• Integrated stainless-steel buckles reduce snag hazards
• Large pull-tab for easy donning and doffing in a drysuit (removable if preferred)
• Exceptional manoeuvrability in confined spaces — minimal silt disturbance
• Compatible with both wetsuits and drysuits
• Weight sits between the RK3 and RK3 HD — the ideal all-rounder

Available In

Black, Orange, and White — in Small, Medium, and Large. XL Sizing coming soon.

Sizing