Compass “Professional” 300N Automatic Lifejacket with Integral Harness. Even in the roughest sea and wearing heavy oilskins the large buoyancy reserves and the twin chambers (30 litres) turn the body immediately into a position where even an unconscious person is supported correctly. Inc. harness. The chest strap has a maximum length of about 135 cm. Suitable for adults and children from 1.50 m height and 40 kg body weight.