This a quote from the creator Zulumatata (Stefan t.) about his routes that make up the Butterfly Loop.
“This terrific ride in the heart of Switzerland may be your challenge! Enjoy this continuous ride over six famous mountains i.e. Oberalp (2040m), Lukmanier (1916m), Gotthard (2091m), Susten (2259m), Grimsel (2164m) and Furka (2429m) with it’s corresponding downhill’s. The whole ride of about 270 km with it’s total of 7500 m of ascend and descent is just astonishing! To make your ride enjoyable, there are 13 longer stages (A to M) and 29 shorter parts (1 to 29) for everybody to enjoy at it’s max. Why is it called the Swiss Butterfly Loop? Plot your entire ride onto a map an see it’s shape! it looks like a butterfly!!! Enjoy riding and keep smiling on uphill’s. PS: videos are recorded and uploaded on 2.7k.”