This BC has been redesigned for 2008 to meet the stringent requirements of Public Safety Divers (PSD) and Military divers around the world with regard to diving either in polluted water or HAZMAT conditions. The BC is now made with single bag construction and the IQ™ has new materials added to prevent adsorption of toxic liquids and other undesirable substances. This makes the BC and harness easy to decontaminate. Both harness and BC use a TPU 2008 Nylon 420 Denier 4.7 oz (coated on both sides) giving outstanding chemical and abrasion resistance. The harness now incorporates a heavy duty 8mm D-Ring so that the diver can be tethered and lifted out of the water. Which is a VERY nice feature!!