Ruffwear Flagline Ultralight Running Harness — for Large Breeds — Great Dane, Mastiff, Rottweiler, German Shepherd

Weighing only 4.9 oz in size L, the Ruffwear Flagline is an ultralight trail running harness designed for unrestricted shoulder motion during canicross, skijoring, and trail running with athletic large breeds including Vizslas, Weimaraners, and Rhodesian Ridgebacks. A single continuous webbing loop forms the harness structure, eliminating the bulk and stitch points that add weight, while still providing 800 lb-rated attachment via a built-in aluminum V-ring. The low-profile design does not snag on brush or rock faces during scrambling, and reflective stitching provides trail safety in dawn and dusk running conditions. Fits chest girth 24–38 inches across large and extra-large athletic breeds.