The Solvay Hut at 4003 m is the highest hut on the Matterhorn. It is a small emergency refuge for about 10 persons situated on a ledge immediately above the Moseley Slab on the Hörnligrat. It is strictly to be used in the event of an emergency. About two thirds up the mountain, 743 m above the Hörnli Hut and 475 m below the summit, many Matterhorn climbers have rested on the small ledge outside the hut admiring the spectacular view of all the Monte Rosa summits.
The hut was built in August 1915. All the building material was brought up to the Hörnli Hut at 3260 m by help of animals. From there a small temporary cable car was used to transport the material up to the building site at 4000 meter. The hut was erected within only five days. In 1966 the hut was rebuilt and in 1976 an emergency telephone was installed.