For technical diving the W100is the right choice. 

The W100 is a single bladder tech-wing purpose-designed for divers who need to carry more equipment than normal sport-divers and has a wide displayed wing contour to optimise the space between the wing legs, for double tanks. 

ClamRetract gives superior deflation capabilities and greater volume increases. 

Three dump valves and an inflator with a stainless steel mechanism controls inflation and deflation reliably and safely, whilst the bladder design compensates for the weight of the tank when submersed and gives you total freedom of movement. 

The narrow air passage behind the neck does not to push the head forward or conflict with regulator and hoses when inflated. 

Another example of superb, Poseidon ergonomics. 

The W100 is made for equipment with a negative weight in water that does not exceed 32 kgs (70,5 lbs) and has a lifting capacity of 353 Nm. The standard tank attachment system is a double Non-flex tankband and this BESEA can be equipped with integrated weight pockets, accessory pockets, metal back plate, Q.M.R.-system? Pinbolt kit and D-rings. 

Ergonomic properties developed from advanced back-packs together with a unique variety of adjustment options makes this harness extraordinary.  
 
No more stiff and sore shoulders after a dive due to heavy tanks carried in both water and on dry land.  
 
Add to this the possibility to adjust the harness to optimize both fit and comfort.  
 
The Besea Advanced harness Mk3 is a development of earlier models of the harness, where we have integrated the waist belts and Lumbar Support in to one belt. It has the same ergonomic advantages but a better fit.  
 
Additionally, we have made attaching the wing to the harness a lot easier. No more need for screws to attach the wing.  
 
The third major change we´ve made, is that we have made the shoulder straps narrower, for better comfort and fit.