Primus has been appointed offic al fuel supplier to the Montane Yukon Arctic Ultra. Known also as MYAU, it is described as the hardest and coldest endurance races in the world. Following on the track of the Yukon Quest sled-dog race, it challenges runners, cyclists and cross-country skiers to cover distances of between 100 and 430 miles while being fully self-supported. The race is organized by a German company, The Great Outdoors