The Apeks RK3 Fins are made from a rugged thermoplastic rubber fin featuring an oversized foot pocket to accommodate drysuit boots and a spring strap for easy donning and doffing.

The RK3 fins are based on one of the first vented rubber fins sold in North America and are popular among military and professional divers. For decades, the design has been the standard gear issue fin for military, special ops, coast guard, and public safety divers.

Apeks RK3 Fins features

A short wide blade provides maximum forward thrust while maintaining great manoeuvrability. The blade material is designed to withstand temperatures and abuse in the toughest environments.

The vented blade design reduces resistance on the upstroke and enhances thrust on the downstroke. The vents also eliminate vortexes that can occur along the back of the blade, much like split fins eliminate the vortex.

Two large grommet holes designed to fit most karabiners for easy storage of the fins while accessing the dive site.

Spring straps as standard. Custom-designed buckle holds spring straps in optimum position. Simple push pin design allows simple replacement of springs if necessary.

Fin sizing

Apeks didn’t give the RK3 fin a shoe size range, as this can be very misleading. The environment that an RK3 is used in will tend to dictate the fin size you need.

For example, do you dive in a warm environment wearing wetsuit boots, or are you walking across pebbled beaches and wearing a drysuit and rigid dry boots? Both forms of footwear may be a UK size 9 but will take up different amounts of space in the fin foot pocket.