Apeks WSX Air CellThe bladder is constructed from Armoguard, a super tough material normally found in public safety diving and military products. This smooth material is ten times more abrasion resistant than standard CorduraTM (the material used on many other sidemount harness bladders), making this a wing designed with serious sidemount diving in mind. Features: WSX Air Cell 45lb: 200N (45lbs) lift Armoguard protects the bladder against abrasions in confined spaces.