Apeks uses Armoguard, a tough material found in military products, to construct the bladder. Armoguard is ten times more resistant to abrasions than the standard material, making this product essential for a diver who is serious about sidemount diving. Apeks SlideLock technology for the D-ring permits for an easy position change while buoyancy fluxuates during a dive. This also eliminates the need to clip your cylinder on and off. All you need to do is adjust the D-ring during your dive. The system is made of 2 plate pieces that are adjustable to any size diver. The WSX is made of individual webbing sections instead of one long piece running through the harness. This feature allows the complete system to be adjusted.