The trek to Mount Everest Base Camp is the ideal setting to test gear, due to the rugged terrain, tough living conditions, and massive fluctuations in temperature. In May, our reporter Ben Ayers completed the 11-day hike to Mount Everest Base Camp, before spending a month living at 17,500 feet.

　　During his reporting mission, Ayers tested a wide range of gear. He says that smart use of base layer and midl ayer garmets kept him warm and dry amid the temperature changes. In his latest video, Ayers discusses the often overlooked clothing that helped him thrive.