For booking of any Trekking in Nepal and Tibet P. Ltd. trekking and Mountaineering Expedition, travel insurance is compulsory. In internet, you can search and choose best travel insurance service among the whole lot of insurance companies which provides according to your convenience. The most important point is that the policy of the insurance company gives should cover the process of giving Helicopter service rescue from the mountains in case of Altitude Sickness or other accidents during the trip with cover of at least worth of US $ 100,000