The environment that an RK3 HD is used in will tend to dictate the size of fin that you need

with the flexibility to adjust its external envelope for your storage needs

the Luna-X can be attached to BCD

Whatever your overhead environment

We didn't give the RK3 fin a shoe size range as this can be very misleading

wtx d single cylinder wings bcd accessory Size:D18 The environment that an RK3Single cylinder wings, often referred to as donuts, are oval shaped air cells or bladders that are not permanently attached to a harness. While single cylinder wings have their origins in the realm of technical diving, they are becoming very popular in the recreational community. Not only are these single cylinder wings streamlined, but due to their shape being a continuous loop, they are very stable underwater. There is no dramatic shift of air from