The RK3 HD is the next fin in the RK3 range of fins. The RK3 HD is made from a higher density material than the standard RK3, which makes the fin stiffer and heavier. The RK3 HD was developed in response to feedback from divers who prefer a heavier fin. The new compound of the RK3 HD adds weight to make it more negatively buoyant than the standard RK3.
An ideal fin for dry suit diving.
 
Size Guide:
 
Size
RK3
RK3HD
Medium           
982gm per fin
Blade 49cm
Foot depth 22cm
Foot width 9cm 
1.1Kg per fin
Blade 49cm
Foot depth 22cm
Foot width 9cm
Large 
1.19kg per fin
Blade 54.5cm
Foot depth 25.5cm
Foot width 9.5cm 
1.4Kg per fin
Blade 54.5cm
Foot depth 25.5cm
Foot width 9.5cm
Super 
1.27kg per fin 
Blade 57cm
Foot depth 27cm
Foot width 10cm
 
1.44Kg per fin
Blade 57cm
Foot depth 27cm
Foot width 10cm