Mammut. According to the query on the first brand website, Mammut is a Swiss outdoor products brand founded in 1862. Mammut’s trademark is also an M letter, but the design is different from MEC and Montbell. Mammut’s M letter is composed of two triangles. , looks sharper, Mammut's sun protection clothing uses high-tech materials, has multiple functions such as UV protection, windproof, and breathability, and is very suitable for alpine sports.