Apeks RK3 fins have been made as a durable, reliable fin designed in collaboration with the US militrary. The thermoplastic fin has an oversized footpocket to fit dive boots with a compact blade for use in harsh environments offering great manoeuvrability. The spring straps on the footpocket are easy to use even in gloves so you can always easily adjust your fit. The vented blades reduce resistance on the upstroke and maximise thrust in the downstroke, and eliminates vortexes forming which can work against the blade. Large grommet holes in both fins fit karabiners make for ideal fin storage.