Hi AUS4,
Did you happen to visit our website? The Flux is not the only suit we design, as with most brands we make suits for specific conditions / temperatures.
Not many sailors in Australia would need the warmth of a single lined suit, so our Lava series is mostly aimed at the European market. Single lined suits require far more care in handling and not everybody likes the restriction in harness movement around the body.
So the Flux is far more fit for purpose in the Australian market. A 3/2 smoothie may have similar warmth than a 5/3 double lined, but the 5/3 DL will be more durable, as warm, with less restriction in movement. I know which I would prefer

Cheers
Marco
Lava Series - Single lined (smooth skin)
Diablo Series - More price conscious & durable