4TUL, which stands 4 Trails Ultra Loop, was founded in 2020. This 189km loop starts and ends at Tai Mo Shan, with 95% of the route falling within Hong Kong's four major trails:  the MacLehose Trail, Wilson Trail, Hong Kong Trail, and Lantau Trail). The loop is connected by public transportation and the section to be completed on foot covers a total of 146km.

The 5th edition of 4TUL (Part 1), to be held on 2nd March 2025, will cover the Wilson Trail & MacLehose Trail. The race starts in Yau Tong and finishes at Shing Mun and Tai Mo Shan for distances of 27km and 45km respectively.

4 Trails Ultra Loop (簡稱4TUL) 始於2020年。路線為一個大環形，總距離為189公里，起點及終點均在大帽山。 95%的4TUL路線落在香港4條主要山徑 (即麥理浩徑、衛奕信徑、港島徑及鳳凰徑) 。完成這環形路線要以公共交通工具連接，實際需要跑步的距離約為146公里。​

第五屆4TUL (Part 1) 將在2025年3月2日舉行。賽事共分27公里及45公里兩個距離，由油塘起步。比賽路線為先經衛奕信徑，再接麥理浩徑，終點分別設於城門及大帽山。