KWARK Navy Extreme Overall is intended for divers swimming in very cold waters, using laminated dry suits. Diffrence between Navy and Navy Extreme are extra pads of Thinsulate weighning on chest, hips and back of divers body. In those places weigning is about 600 g/m giving extreme thermal protection. The material is produced on special order from the U.S. Army Special Forces Divers, in order to meet all the required parameters for long-diving in cold waters. Thermally, KWARK Navy Body Warmer is equivalent to traditional warmers based on Thinsulate weighing about 400 g / m. However, NAVY has many advantages, about which users of such conventional warmers can only dream of. The primary advantage of the Navy is its flexibility. This is not a medieval knight armor with which thick warmers are associated with. Features: It is very comfortable and gives you a full range of motion Its easy to put on a dry suit on it, NAVY doesnt roll up Provides very good air flow It is very light, weighin